diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/.gitattributes b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/.gitattributes
new file mode 100644
index 0000000..8bca8e4
--- /dev/null
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/.gitattributes
@@ -0,0 +1,8 @@
+# Ignore HTML files in Resources and subdirectories
+Resources/**/*.html linguist-vendored
+
+# Ignore CSS files in Resources and subdirectories
+Resources/**/*.css linguist-vendored
+
+# Ignore JS files in Resources and subdirectories
+Resources/**/*.js linguist-vendored
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/ChmWebpagePanel.cs b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/ChmWebpagePanel.cs
new file mode 100644
index 0000000..c9dc326
--- /dev/null
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/ChmWebpagePanel.cs
@@ -0,0 +1,125 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using QuickLook.Plugin.HtmlViewer;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+
+namespace QuickLook.Plugin.ChmViewer;
+
+public class ChmWebpagePanel : WebpagePanel
+{
+    private const string _resourcePrefix = "QuickLook.Plugin.ChmViewer.Resources.";
+    private static readonly Dictionary<string, byte[]> _resources = [];
+    private readonly byte[] _homePage;
+
+    static ChmWebpagePanel()
+    {
+        InitializeResources();
+    }
+
+    public ChmWebpagePanel()
+    {
+        _homePage = ReadResource("/chm2html.html") ?? [];
+    }
+
+    private static void InitializeResources()
+    {
+        if (_resources.Any())
+            return;
+
+        var assembly = Assembly.GetExecutingAssembly();
+        foreach (var resourceName in assembly.GetManifestResourceNames())
+        {
+            if (!resourceName.StartsWith(_resourcePrefix, StringComparison.Ordinal))
+                continue;
+
+            var relativePath = resourceName.Substring(_resourcePrefix.Length).Replace('\\', '/');
+            if (string.IsNullOrEmpty(relativePath))
+                continue;
+
+            using var stream = assembly.GetManifestResourceStream(resourceName);
+            if (stream == null)
+                continue;
+
+            using var memoryStream = new MemoryStream();
+            stream.CopyTo(memoryStream);
+            _resources[$"/{relativePath}"] = memoryStream.ToArray();
+        }
+    }
+
+    public void PreviewCompiledHtmlHelp(string path)
+    {
+        FallbackPath = Path.GetDirectoryName(path);
+
+        var chmFileUrl = Helper.FilePathToFileUrl(path);
+        var pluginUri = new Uri($"file://quicklook/?plugin=1&chm={Uri.EscapeDataString(chmFileUrl.AbsoluteUri)}");
+
+        NavigateToUri(pluginUri);
+    }
+
+    protected override void WebView_WebResourceRequested(object sender, Microsoft.Web.WebView2.Core.CoreWebView2WebResourceRequestedEventArgs args)
+    {
+        try
+        {
+            if (string.IsNullOrWhiteSpace(args.Request.Uri))
+            {
+                base.WebView_WebResourceRequested(sender, args);
+                return;
+            }
+
+            var requestedUri = new Uri(args.Request.Uri);
+            if (requestedUri.Scheme != "file")
+            {
+                base.WebView_WebResourceRequested(sender, args);
+                return;
+            }
+
+            var requestedPath = Uri.UnescapeDataString(requestedUri.AbsolutePath);
+            if (requestedPath == "/")
+            {
+                var response = _webView.CoreWebView2.Environment.CreateWebResourceResponse(
+                    new MemoryStream(_homePage), 200, "OK", MimeTypes.GetContentType(".html"));
+                args.Response = response;
+                return;
+            }
+
+            if (ContainsKey(requestedPath))
+            {
+                var response = _webView.CoreWebView2.Environment.CreateWebResourceResponse(
+                    ReadStream(requestedPath), 200, "OK", MimeTypes.GetContentType(Path.GetExtension(requestedPath)));
+                args.Response = response;
+                return;
+            }
+
+            base.WebView_WebResourceRequested(sender, args);
+        }
+        catch
+        {
+            base.WebView_WebResourceRequested(sender, args);
+        }
+    }
+
+    private static bool ContainsKey(string key) => _resources.ContainsKey(key);
+
+    private static Stream ReadStream(string key) => new MemoryStream(_resources[key]);
+
+    private static byte[] ReadResource(string key) => _resources.TryGetValue(key, out var value) ? value : null;
+}
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Helper.cs b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Helper.cs
new file mode 100644
index 0000000..4ed82fc
--- /dev/null
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Helper.cs
@@ -0,0 +1,52 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.IO;
+using System.Text;
+
+namespace QuickLook.Plugin.ChmViewer;
+
+internal static class Helper
+{
+    public static Uri FilePathToFileUrl(string filePath)
+    {
+        var uri = new StringBuilder();
+        foreach (var v in filePath)
+            if (v >= 'a' && v <= 'z' || v >= 'A' && v <= 'Z' || v >= '0' && v <= '9' ||
+                v == '+' || v == '/' || v == ':' || v == '.' || v == '-' || v == '_' || v == '~' ||
+                v > '\x80')
+                uri.Append(v);
+            else if (v == Path.DirectorySeparatorChar || v == Path.AltDirectorySeparatorChar)
+                uri.Append('/');
+            else
+                uri.Append($"%{(int)v:X2}");
+        if (uri.Length >= 2 && uri[0] == '/' && uri[1] == '/') // UNC path - Universal Naming Convention
+            uri.Insert(0, "file:");
+        else
+            uri.Insert(0, "file:///");
+
+        try
+        {
+            return new Uri(uri.ToString());
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Plugin.cs b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Plugin.cs
index a8d958b..9d725b5 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Plugin.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Plugin.cs
@@ -24,7 +24,13 @@ namespace QuickLook.Plugin.ChmViewer;
 
 public sealed class Plugin : IViewer
 {
-    public int Priority => 0;
+    private ChmWebpagePanel _panel;
+
+    /// <summary>
+    /// The implementation of this plugin is better than following
+    /// https://github.com/emako/QuickLook.Plugin.SumatraPDFReader
+    /// </summary>
+    public int Priority => 2;
 
     public void Init()
     {
@@ -32,26 +38,29 @@ public sealed class Plugin : IViewer
 
     public bool CanHandle(string path)
     {
-        return false;
-#pragma warning disable CS0162 // Unreachable code detected
         return !Directory.Exists(path)
             && Path.GetExtension(path).Equals(".chm", StringComparison.OrdinalIgnoreCase);
-#pragma warning restore CS0162 // Unreachable code detected
     }
 
     public void Prepare(string path, ContextObject context)
     {
-        context.Title = Path.GetFileName(path);
-        context.IsBlocked = true;
-        context.PreferredSize = new Size { Width = 800, Height = 600 };
+        context.PreferredSize = new Size(1280, 720);
     }
 
     public void View(string path, ContextObject context)
     {
+        _panel = new ChmWebpagePanel();
+        _panel.PreviewCompiledHtmlHelp(path);
+
+        context.ViewerContent = _panel;
+        context.Title = Path.GetFileName(path);
         context.IsBusy = false;
     }
 
     public void Cleanup()
     {
+        _panel?.Dispose();
+        _panel = null;
+        GC.SuppressFinalize(this);
     }
 }
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/QuickLook.Plugin.ChmViewer.csproj b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/QuickLook.Plugin.ChmViewer.csproj
index 4d6aa2f..3fc929f 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/QuickLook.Plugin.ChmViewer.csproj
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/QuickLook.Plugin.ChmViewer.csproj
@@ -76,6 +76,21 @@
             <Name>QuickLook.Common</Name>
             <Private>False</Private>
         </ProjectReference>
+        <ProjectReference Include="..\QuickLook.Plugin.HtmlViewer\QuickLook.Plugin.HtmlViewer.csproj">
+            <Project>{CE22A1F3-7F2C-4EC8-BFDE-B58D0EB625FC}</Project>
+            <Name>QuickLook.Plugin.HtmlViewer</Name>
+            <Private>False</Private>
+        </ProjectReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.3912.50">
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <EmbeddedResource Include="Resources\chm2html.html" />
     </ItemGroup>
 
 </Project>
diff --git a/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Resources/chm2html.html b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Resources/chm2html.html
new file mode 100644
index 0000000..70666b3
--- /dev/null
+++ b/QuickLook.Plugin/QuickLook.Plugin.ChmViewer/Resources/chm2html.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>chm2html — CHM Viewer (Plugin)</title>

+  <script>window.__CHM2HTML_PLUGIN = true;</script>
+  
+<script type="module">
+// inlined assets/app-B1f0-Pbl.js
+(function(){const t=document.createElement("link").relList;if(t&&t.supports&&t.supports("modulepreload"))return;for(const s of document.querySelectorAll('link[rel="modulepreload"]'))r(s);new MutationObserver(s=>{for(const i of s)if(i.type==="childList")for(const o of i.addedNodes)o.tagName==="LINK"&&o.rel==="modulepreload"&&r(o)}).observe(document,{childList:!0,subtree:!0});function n(s){const i={};return s.integrity&&(i.integrity=s.integrity),s.referrerPolicy&&(i.referrerPolicy=s.referrerPolicy),s.crossOrigin==="use-credentials"?i.credentials="include":s.crossOrigin==="anonymous"?i.credentials="omit":i.credentials="same-origin",i}function r(s){if(s.ep)return;s.ep=!0;const i=n(s);fetch(s.href,i)}})();const et="modulepreload",tt=function(e){return"/"+e},_e={},nt=function(t,n,r){let s=Promise.resolve();if(n&&n.length>0){let o=function(l){return Promise.all(l.map(f=>Promise.resolve(f).then(d=>({status:"fulfilled",value:d}),d=>({status:"rejected",reason:d}))))};document.getElementsByTagName("link");const a=document.querySelector("meta[property=csp-nonce]"),c=a?.nonce||a?.getAttribute("nonce");s=o(n.map(l=>{if(l=tt(l),l in _e)return;_e[l]=!0;const f=l.endsWith(".css"),d=f?'[rel="stylesheet"]':"";if(document.querySelector(`link[href="${l}"]${d}`))return;const h=document.createElement("link");if(h.rel=f?"stylesheet":et,f||(h.as="script"),h.crossOrigin="",h.href=l,c&&h.setAttribute("nonce",c),document.head.appendChild(h),f)return new Promise((w,v)=>{h.addEventListener("load",w),h.addEventListener("error",()=>v(new Error(`Unable to preload CSS for ${l}`)))})}))}function i(o){const a=new Event("vite:preloadError",{cancelable:!0});if(a.payload=o,window.dispatchEvent(a),!a.defaultPrevented)throw o}return s.then(o=>{for(const a of o||[])a.status==="rejected"&&i(a.reason);return t().catch(i)})};class C{view;_offset;constructor(t,n=0){this.view=new DataView(t.buffer,t.byteOffset,t.byteLength),this._offset=n}get offset(){return this._offset}get remaining(){return this.view.byteLength-this._offset}readUint8(){if(this._offset+1>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 1)`);const t=this.view.getUint8(this._offset);return this._offset+=1,t}readInt16LE(){if(this._offset+2>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 2)`);const t=this.view.getInt16(this._offset,!0);return this._offset+=2,t}readUint16LE(){if(this._offset+2>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 2)`);const t=this.view.getUint16(this._offset,!0);return this._offset+=2,t}readInt32LE(){if(this._offset+4>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 4)`);const t=this.view.getInt32(this._offset,!0);return this._offset+=4,t}readUint32LE(){if(this._offset+4>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 4)`);const t=this.view.getUint32(this._offset,!0);return this._offset+=4,t}readBigInt64LE(){if(this._offset+8>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 8)`);const t=this.view.getBigInt64(this._offset,!0);return this._offset+=8,t}readBigUint64LE(){if(this._offset+8>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need 8)`);const t=this.view.getBigUint64(this._offset,!0);return this._offset+=8,t}readBytes(t){if(this._offset+t>this.view.byteLength)throw new RangeError(`BufferReader: read past end (offset=${this._offset}, need ${t})`);const n=new Uint8Array(this.view.buffer,this.view.byteOffset+this._offset,t);return this._offset+=t,n.slice()}readAscii(t){const n=this.readBytes(t);return String.fromCharCode(...n)}skip(t){if(this._offset+t>this.view.byteLength)throw new RangeError(`BufferReader: skip past end (offset=${this._offset}, skip ${t})`);this._offset+=t}readCWord(){let t=0n,n;for(;(n=this.readUint8())>=128;)t<<=7n,t+=BigInt(n&127);return(t<<7n)+BigInt(n)}}const Re=88,Te=96;function rt(e){if(e.length!==Re&&e.length!==Te)throw new Error(`ITSF header: unexpected length ${e.length}`);const t=new C(e),n=t.readAscii(4),r=t.readInt32LE(),s=t.readInt32LE();t.readInt32LE();const i=t.readUint32LE(),o=t.readUint32LE(),a=t.readBytes(16),c=t.readBytes(16),l=t.readBigUint64LE(),f=t.readBigUint64LE(),d=t.readBigUint64LE(),h=t.readBigUint64LE();if(n!=="ITSF")throw new Error(`ITSF header: bad signature "${n}"`);if(r===2){if(s<Re)throw new Error(`ITSF v2 header too short: ${s}`)}else if(r===3){if(s<Te)throw new Error(`ITSF v3 header too short: ${s}`)}else throw new Error(`ITSF header: unsupported version ${r}`);let w;if(r===3){if(t.remaining<8)throw new Error("ITSF v3 header: missing data_offset field");w=t.readBigUint64LE()}else w=d+h;return{signature:n,version:r,headerLen:s,lastModified:i,langId:o,dirUuid:a,streamUuid:c,unknownOffset:l,unknownLen:f,dirOffset:d,dirLen:h,dataOffset:w}}const ke=84;function st(e){if(e.length!==ke)throw new Error(`ITSP header: unexpected length ${e.length}`);const t=new C(e),n=t.readAscii(4),r=t.readInt32LE(),s=t.readInt32LE();t.readInt32LE();const i=t.readUint32LE();t.readInt32LE(),t.readInt32LE();const o=t.readInt32LE(),a=t.readInt32LE();t.readInt32LE();const c=t.readUint32LE();t.readInt32LE();const l=t.readUint32LE(),f=t.readBytes(16);if(t.readBytes(16),n!=="ITSP")throw new Error(`ITSP header: bad signature "${n}"`);if(r!==1)throw new Error(`ITSP header: unsupported version ${r}`);if(s!==ke)throw new Error(`ITSP header: unexpected headerLen ${s}`);return{signature:n,version:r,headerLen:s,blockLen:i,blockidxIntvl:0,indexDepth:0,indexRoot:o,indexHead:a,numBlocks:c,langId:l,systemUuid:f}}function Se(e){if(e.length<20)throw new Error(`PMGL header: too short (${e.length})`);const t=new C(e),n=t.readAscii(4),r=t.readUint32LE();t.readUint32LE();const s=t.readInt32LE(),i=t.readInt32LE();if(n!=="PMGL")throw new Error(`PMGL header: bad signature "${n}"`);return{signature:n,freeSpace:r,blockPrev:s,blockNext:i}}function it(e){if(e.length<8)throw new Error(`PMGI header: too short (${e.length})`);const t=new C(e),n=t.readAscii(4),r=t.readUint32LE();if(n!=="PMGI")throw new Error(`PMGI header: bad signature "${n}"`);return{signature:n,freeSpace:r}}const ot=40;function at(e){if(e.length!==ot)throw new Error(`LZXC reset table: unexpected length ${e.length}`);const t=new C(e),n=t.readUint32LE(),r=t.readUint32LE();t.readUint32LE();const s=t.readUint32LE(),i=t.readBigUint64LE(),o=t.readBigUint64LE(),a=t.readBigUint64LE();if(n!==2)throw new Error(`LZXC reset table: unsupported version ${n}`);return{version:n,blockCount:r,tableOffset:s,uncompressedLen:i,compressedLen:o,blockLen:a}}const ct=24,lt=28;function ft(e){if(e.length<ct)throw new Error(`LZXC control data: too short (${e.length})`);const t=new C(e),n=t.readUint32LE(),r=t.readAscii(4),s=t.readUint32LE();let i=t.readUint32LE(),o=t.readUint32LE();const a=t.readUint32LE();if(e.length>=lt&&t.readUint32LE(),r!=="LZXC")throw new Error(`LZXC control data: bad signature "${r}"`);if(s===2&&(i*=32768,o*=32768),o===0||i===0)throw new Error("LZXC control data: zero windowSize or resetInterval");if(o===1)throw new Error("LZXC control data: windowSize is 1");if(i%(o/2)!==0)throw new Error("LZXC control data: resetInterval not a multiple of windowSize/2");return{size:n,signature:r,version:s,resetInterval:i,windowSize:o,windowsPerReset:a}}const Ie=2,F=256,Ce=1,Ae=2,fe=3,dt=20,Q=7,Ge=249,ne=6,j=dt,re=12,V=F+400,se=12,q=Ge+1,ie=7,Y=8,ee=64,de=32,xe=new Uint8Array([0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17]),Ne=new Uint32Array([0,1,2,3,4,6,8,12,16,24,32,48,64,96,128,192,256,384,512,768,1024,1536,2048,3072,4096,6144,8192,12288,16384,24576,32768,49152,65536,98304,131072,196608,262144,393216,524288,655360,786432,917504,1048576,1179648,1310720,1441792,1572864,1703936,1835008,1966080,2097152]);function te(e,t,n,r){let s,i=1,o=0,a=1<<t,c=a>>1,l=c;for(;i<=t;){for(let f=0;f<e;f++)if(n[f]===i){if(s=o,(o+=c)>a)return 1;let d=c;for(;d-- >0;)r[s++]=f}c>>=1,i++}if(o!==a){for(let f=o;f<a;f++)r[f]=0;for(o<<=16,a<<=16,c=32768;i<=16;){for(let f=0;f<e;f++)if(n[f]===i){s=o>>16;for(let d=0;d<i-t;d++)r[s]===0&&(r[l<<1]=0,r[(l<<1)+1]=0,r[s]=l++),s=r[s]<<1,o>>15-d&1&&s++;if(r[s]=f,(o+=c)>a)return 1}c>>=1,i++}}if(o===a)return 0;for(let f=0;f<e;f++)if(n[f])return 1;return 0}class ut{window;windowSize;actualSize;windowPosn;R0;R1;R2;mainElements;headerRead;blockType;blockLength;blockRemaining;framesRead;intelFilesize;intelCurpos;intelStarted;PRETREE_table;PRETREE_len;MAINTREE_table;MAINTREE_len;LENGTH_table;LENGTH_len;ALIGNED_table;ALIGNED_len;constructor(t){if(t<15||t>21)throw new RangeError(`LZXState: invalid window size bits ${t} (must be 15-21)`);const n=1<<t;let r;t===20?r=42:t===21?r=50:r=t<<1,this.window=new Uint8Array(n),this.windowSize=n,this.actualSize=n,this.windowPosn=0,this.R0=this.R1=this.R2=1,this.mainElements=F+(r<<3),this.headerRead=!1,this.framesRead=0,this.blockRemaining=0,this.blockType=0,this.blockLength=0,this.intelCurpos=0,this.intelStarted=!1,this.intelFilesize=0,this.PRETREE_table=new Uint16Array((1<<ne)+(j<<1)),this.PRETREE_len=new Uint8Array(j+ee),this.MAINTREE_table=new Uint16Array((1<<re)+(V<<1)),this.MAINTREE_len=new Uint8Array(V+ee),this.LENGTH_table=new Uint16Array((1<<se)+(q<<1)),this.LENGTH_len=new Uint8Array(q+ee),this.ALIGNED_table=new Uint16Array((1<<ie)+(Y<<1)),this.ALIGNED_len=new Uint8Array(Y+ee)}reset(){this.R0=this.R1=this.R2=1,this.headerRead=!1,this.framesRead=0,this.blockRemaining=0,this.blockType=0,this.intelCurpos=0,this.intelStarted=!1,this.windowPosn=0,this.MAINTREE_len.fill(0),this.LENGTH_len.fill(0)}}const ge=0,ht=1,T=2;function Ue(e,t,n,r,s){const i=e.window,o=e.windowSize;let a=e.windowPosn,c=e.R0,l=e.R1,f=e.R2,d=0,h=0,w=0;const v=r;function k(g){for(;h<g;){const E=w<r?t[w]:0,L=w+1<r?t[w+1]:0;d=(d|(L<<8|E)<<de-16-h)>>>0,h+=16,w+=2}}function U(g){return d>>>de-g>>>0}function A(g){d=d<<g>>>0,h-=g}function p(g){k(g);const E=U(g);return A(g),E}function y(g,E,L,m){k(16);let u=g[U(L)];if(u>=m){let I=1<<de-L;do{if(I>>>=1,u<<=1,u|=d&I?1:0,!I)return-1;u=g[u]}while(u>=m)}const b=E[u];return A(b),u}function B(g,E,L){for(let u=0;u<20;u++)e.PRETREE_len[u]=p(4);if(te(j,ne,e.PRETREE_len,e.PRETREE_table))return!0;let m=E;for(;m<L;){const u=y(e.PRETREE_table,e.PRETREE_len,ne,j);if(u<0)return!0;if(u===17){let b=p(4)+4;for(;b-- >0;)g[m++]=0}else if(u===18){let b=p(5)+20;for(;b-- >0;)g[m++]=0}else if(u===19){let b=p(1)+4;const I=y(e.PRETREE_table,e.PRETREE_len,ne,j);if(I<0)return!0;let S=g[m]-I;for(S<0&&(S+=17);b-- >0;)g[m++]=S}else{let b=g[m]-u;b<0&&(b+=17),g[m++]=b}}return!1}let _=s;if(!e.headerRead){let g=0,E=0;p(1)&&(g=p(16),E=p(16)),e.intelFilesize=g<<16|E,e.headerRead=!0}for(;_>0;){if(e.blockRemaining===0){e.blockType===fe&&(e.blockLength&1&&w++,h=0,d=0),e.blockType=p(3);const g=p(16),E=p(8);switch(e.blockRemaining=e.blockLength=g<<8|E,e.blockType){case Ae:for(let L=0;L<8;L++)e.ALIGNED_len[L]=p(3);if(te(Y,ie,e.ALIGNED_len,e.ALIGNED_table))return T;case Ce:if(B(e.MAINTREE_len,0,256)||B(e.MAINTREE_len,256,e.mainElements)||te(V,re,e.MAINTREE_len,e.MAINTREE_table)||(e.MAINTREE_len[232]!==0&&(e.intelStarted=!0),B(e.LENGTH_len,0,Ge))||te(q,se,e.LENGTH_len,e.LENGTH_table))return T;break;case fe:e.intelStarted=!0,k(16),h>16&&(w-=2),c=(t[w]|t[w+1]<<8|t[w+2]<<16|t[w+3]<<24)>>>0,w+=4,l=(t[w]|t[w+1]<<8|t[w+2]<<16|t[w+3]<<24)>>>0,w+=4,f=(t[w]|t[w+1]<<8|t[w+2]<<16|t[w+3]<<24)>>>0,w+=4;break;default:return T}}if(w>v&&(w>v+2||h<16))return T;for(;e.blockRemaining>0&&_>0;){let g=e.blockRemaining;if(g>_&&(g=_),_-=g,e.blockRemaining-=g,a&=o-1,a+g>o)return ht;switch(e.blockType){case Ce:for(;g>0;){const E=y(e.MAINTREE_table,e.MAINTREE_len,re,V);if(E<0)return T;if(E<F)i[a++]=E,g--;else{const L=E-F;let m=L&Q;if(m===Q){const S=y(e.LENGTH_table,e.LENGTH_len,se,q);if(S<0)return T;m+=S}m+=Ie;let u=L>>3;if(u>2){if(u!==3){const S=xe[u],O=p(S);u=Ne[u]-2+O}else u=1;f=l,l=c,c=u}else u===0?u=c:u===1?(u=l,l=c,c=u):(u=f,f=c,c=u);let b=a,I=b-u;if(a+=m,a>o)return T;for(g-=m;I<0&&m-- >0;)i[b++]=i[I+o],I++;for(;m-- >0;)i[b++]=i[I++]}}break;case Ae:for(;g>0;){const E=y(e.MAINTREE_table,e.MAINTREE_len,re,V);if(E<0)return T;if(E<F)i[a++]=E,g--;else{const L=E-F;let m=L&Q;if(m===Q){const S=y(e.LENGTH_table,e.LENGTH_len,se,q);if(S<0)return T;m+=S}m+=Ie;let u=L>>3;if(u>2){const S=xe[u];if(u=Ne[u]-2,S>3){const O=p(S-3);u+=O<<3;const ve=y(e.ALIGNED_table,e.ALIGNED_len,ie,Y);if(ve<0)return T;u+=ve}else if(S===3){const O=y(e.ALIGNED_table,e.ALIGNED_len,ie,Y);if(O<0)return T;u+=O}else if(S>0){const O=p(S);u+=O}else u=1;f=l,l=c,c=u}else u===0?u=c:u===1?(u=l,l=c,c=u):(u=f,f=c,c=u);let b=a,I=b-u;if(a+=m,a>o)return T;for(g-=m;I<0&&m-- >0;)i[b++]=i[I+o],I++;for(;m-- >0;)i[b++]=i[I++]}}break;case fe:if(w+g>v)return T;i.set(t.subarray(w,w+g),a),w+=g,a+=g;break;default:return T}}}if(_!==0)return T;const R=(a===0?o:a)-s;if(n.set(i.subarray(R,R+s),0),e.windowPosn=a,e.R0=c,e.R1=l,e.R2=f,e.framesRead++<32768&&e.intelFilesize!==0)if(s<=6||!e.intelStarted)e.intelCurpos+=s;else{let g=0;const E=s-10;let L=e.intelCurpos;const m=e.intelFilesize;for(e.intelCurpos=L+s;g<E;){if(n[g++]!==232){L++;continue}const u=n[g]|n[g+1]<<8|n[g+2]<<16|n[g+3]<<24;if(u>=-L&&u<m){const b=u>=0?u-L:u+m;n[g]=b&255,n[g+1]=b>>8&255,n[g+2]=b>>16&255,n[g+3]=b>>24&255}g+=4,L+=5}}return ge}var Z=(e=>(e[e.Uncompressed=0]="Uncompressed",e[e.Compressed=1]="Compressed",e))(Z||{}),N=(e=>(e[e.Normal=1]="Normal",e[e.Meta=2]="Meta",e[e.Special=4]="Special",e[e.Files=8]="Files",e[e.Dirs=16]="Dirs",e[e.All=31]="All",e))(N||{});const gt="::DataSpace/Storage/MSCompressed/Transform/{7FC28940-9D31-11D0-9B27-00A0C91E9C7C}/InstanceData/ResetTable",wt="::DataSpace/Storage/MSCompressed/ControlData",mt="::DataSpace/Storage/MSCompressed/Content",ue=5;class be{reader;langId=null;dirOffset=0n;dirLen=0n;dataOffset=0n;indexRoot=0;indexHead=0;blockLen=0;compressionEnabled=!1;rtUnit;cnUnit;resetTable;windowSize=0;resetInterval=0;resetBlkCount=0;lzxState=null;lzxLastBlock=-1;cacheBlocks;cacheBlockIndices;cacheNumBlocks;constructor(t){this.reader=t,this.cacheNumBlocks=ue,this.cacheBlocks=new Array(ue).fill(null),this.cacheBlockIndices=new Array(ue).fill(0n)}static async open(t){const n=new be(t);return await n.init(),n}async init(){const t=await this.reader.read(0n,96),n=rt(t);this.langId=n.langId,this.dirOffset=n.dirOffset,this.dirLen=n.dirLen,this.dataOffset=n.dataOffset;const r=await this.reader.read(n.dirOffset,84),s=st(r);this.dirOffset+=BigInt(s.headerLen),this.dirLen-=BigInt(s.headerLen),this.indexRoot=s.indexRoot<=-1?s.indexHead:s.indexRoot,this.indexHead=s.indexHead,this.blockLen=s.blockLen;try{const i=await this.resolve(gt),o=await this.resolve(mt),a=await this.resolve(wt);if(i&&i.space!==Z.Compressed&&o&&o.space!==Z.Compressed&&a&&a.space!==Z.Compressed){const c=await this.fetchBytes(this.dataOffset+i.start,40),l=at(c),f=await this.fetchBytes(this.dataOffset+a.start,Number(a.length)),d=ft(f);this.rtUnit=i,this.cnUnit=o,this.resetTable=l,this.windowSize=d.windowSize,this.resetInterval=d.resetInterval,this.resetBlkCount=d.resetInterval/(d.windowSize/2)*d.windowsPerReset,this.compressionEnabled=!0}}catch{this.compressionEnabled=!1}}getLanguageId(){return this.langId}close(){this.reader.close&&this.reader.close(),this.lzxState=null,this.cacheBlocks.fill(null)}setCacheSize(t){if(t===this.cacheNumBlocks)return;const n=new Array(t).fill(null),r=new Array(t).fill(0n);for(let s=0;s<this.cacheNumBlocks;s++)if(this.cacheBlocks[s]){const i=Number(this.cacheBlockIndices[s]%BigInt(t));n[i]||(n[i]=this.cacheBlocks[s],r[i]=this.cacheBlockIndices[s])}this.cacheBlocks=n,this.cacheBlockIndices=r,this.cacheNumBlocks=t}async fetchBytes(t,n){return this.reader.read(t,n)}parsePmglEntry(t){if(t.remaining===0)return null;const n=t.readCWord(),r=t.readBytes(Number(n)),s=new TextDecoder("utf-8").decode(r),i=Number(t.readCWord()),o=t.readCWord(),a=t.readCWord();return{start:o,length:a,space:i,flags:0,path:s}}findInPmgi(t,n){const r=it(t.subarray(0,8)),s=t.length-r.freeSpace,i=new C(t,8),o=X(n);let a=-1;for(;i.offset<s;){const c=Number(i.readCWord()),l=i.readBytes(c),f=new TextDecoder("utf-8").decode(l);if(X(f)>o)return a;a=Number(i.readCWord())}return a}findInPmgl(t,n){const r=Se(t.subarray(0,20)),s=t.length-r.freeSpace,i=new C(t,20);for(;i.offset<s;){i.offset;const o=Number(i.readCWord()),a=i.readBytes(o),c=new TextDecoder("utf-8").decode(a);if(X(c)===X(n)){const l=Number(i.readCWord()),f=i.readCWord(),d=i.readCWord();return{start:f,length:d,space:l,flags:0,path:c}}i.readCWord(),i.readCWord(),i.readCWord()}return null}async resolve(t){const n=await this.resolveIndexed(t);if(n)return n;const r=X(t);for await(const s of this.enumerate(N.All))if(X(s.path)===r)return s;return null}async resolveIndexed(t){let n=this.indexRoot;for(;n!==-1;){const r=await this.fetchBytes(this.dirOffset+BigInt(n)*BigInt(this.blockLen),this.blockLen),s=String.fromCharCode(r[0],r[1],r[2],r[3]);if(s==="PMGL")return this.findInPmgl(r,t);if(s==="PMGI")n=this.findInPmgi(r,t);else return null}return null}async retrieve(t,n=0n,r){if(n<0n||n>=t.length)return new Uint8Array(0);const s=r!==void 0?n+r>t.length?t.length-n:r:t.length-n;return s<=0n?new Uint8Array(0):t.space===Z.Uncompressed?this.fetchBytes(this.dataOffset+t.start+n,Number(s)):this.compressionEnabled?this.decompressRegion(t.start+n,s):new Uint8Array(0)}async getCmpBlockBounds(t){const n=this.dataOffset+this.rtUnit.start+BigInt(this.resetTable.tableOffset),r=await this.fetchBytes(n+t*8n,8),i=new C(r).readBigUint64LE();let o;if(t<BigInt(this.resetTable.blockCount-1)){const l=await this.fetchBytes(n+t*8n+8n,8);o=new C(l).readBigUint64LE()}else o=this.resetTable.compressedLen;const a=o-i;return{start:i+this.dataOffset+this.cnUnit.start,len:a}}async decompressOneBlock(t){const n=Number(this.resetTable.blockLen),r=t%this.cacheNumBlocks;this.cacheBlocks[r]||(this.cacheBlocks[r]=new Uint8Array(n)),this.cacheBlockIndices[r]=BigInt(t);const s=this.cacheBlocks[r],{start:i,len:o}=await this.getCmpBlockBounds(BigInt(t)),a=await this.fetchBytes(i,Number(o));let c=Ue(this.lzxState,a,s,Number(o),n);if(c!==ge&&(console.warn(`LZX decompression error code ${c} for block ${t}, retrying after reset`),this.lzxState.reset(),c=Ue(this.lzxState,a,s,Number(o),n),c!==ge)){const l=Array.from(a.subarray(0,Math.min(32,a.length))).map(f=>f.toString(16).padStart(2,"0")).join(" ");throw new Error(`LZX decompression failed for block ${t}: code ${c}. firstBytes=${l}`)}this.lzxLastBlock=t}async decompressBlock(t){const n=Number(t);if(!this.lzxState){let s=0,i=this.windowSize;for(;i>1;)i>>>=1,s++;this.lzxState=new ut(s),this.lzxLastBlock=-1}let r=n%this.resetBlkCount;if(n-r<=this.lzxLastBlock&&n>=this.lzxLastBlock&&(r=n-this.lzxLastBlock),r!==0)for(let s=r;s>0;s--){const i=n-s;this.lzxLastBlock!==i&&(i%this.resetBlkCount===0&&this.lzxState.reset(),await this.decompressOneBlock(i))}else n%this.resetBlkCount===0&&this.lzxState.reset();return await this.decompressOneBlock(n),this.cacheBlocks[n%this.cacheNumBlocks]}async decompressRegion(t,n){if(n<=0n)return new Uint8Array(0);const r=this.resetTable.blockLen,s=new Uint8Array(Number(n));let i=0n,o=n,a=t;for(;o>0n;){const c=a/r,l=a%r;let f=o;f>r-l&&(f=r-l);const d=Number(c%BigInt(this.cacheNumBlocks));if(this.cacheBlocks[d]!==null&&this.cacheBlockIndices[d]===c)s.set(this.cacheBlocks[d].subarray(Number(l),Number(l+f)),Number(i));else{const h=await this.decompressBlock(c);s.set(h.subarray(Number(l),Number(l+f)),Number(i))}i+=f,o-=f,a+=f}return s}async*enumerate(t=N.All){let n=this.indexHead;for(;n!==-1;){const r=await this.fetchBytes(this.dirOffset+BigInt(n)*BigInt(this.blockLen),this.blockLen),s=Se(r.subarray(0,20)),i=r.length-s.freeSpace,o=new C(r,20);for(;o.offset<i;){const a=this.parsePmglEntry(o);if(!a)break;a.flags=pt(a.path),Pe(a.flags,t)&&(yield a)}n=s.blockNext}}async*enumerateDir(t,n=N.All){let r=t;r.length>0&&!r.endsWith("/")&&(r+="/");let s=!1;for await(const i of this.enumerate(N.All)){if(s){if(!i.path.toLowerCase().startsWith(r.toLowerCase()))break}else if(i.length===0n&&i.path.toLowerCase().startsWith(r.toLowerCase())){if(s=!0,i.path.length===r.length)continue}else continue;Pe(i.flags,n)&&(yield i)}}async 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+  
+<style>/* inlined assets/app-EEkus9An.css */
+*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}[hidden]{display:none!important}html{height:100%;overflow:hidden}body{height:100%;overflow:hidden;display:flex;flex-direction:column;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:14px;background:#f5f5f5;color:#222}#toolbar{display:flex;align-items:center;height:42px;padding:0 12px;background:#2c2c2c;color:#eee;gap:8px;flex-shrink:0;user-select:none;position:relative;z-index:10}#toolbar-left{display:flex;align-items:center;gap:4px}#toolbar-right{margin-left:auto;display:flex;align-items:center}.toolbar-title{position:absolute;left:50%;transform:translate(-50%);max-width:50%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;pointer-events:none}.btn{padding:5px 12px;border:1px solid #555;border-radius:4px;background:#3a3a3a;color:#eee;cursor:pointer;font-size:13px;line-height:1.4;transition:background .15s,border-color .15s}.btn:hover:not(:disabled){background:#505050;border-color:#888}.btn:disabled{opacity:.35;cursor:default}.btn.icon-btn{padding:5px 9px}.btn-large{padding:10px 24px;font-size:15px}#status{font-size:12px;color:#ffd;padding:0 8px}#welcome{display:flex;align-items:center;justify-content:center;flex:1;min-height:0;overflow:auto}#drop-zone{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;width:400px;max-width:90vw;padding:48px 32px;border:2px dashed #ccc;border-radius:12px;background:#fff;transition:border-color .2s,background .2s}#drop-zone.drag-over{border-color:#2196f3;background:#e3f2fd}.drop-icon{font-size:48px}.drop-primary{font-size:16px;color:#444}.drop-secondary{font-size:13px;color:#999}#viewer{display:flex;flex:1;min-height:0;overflow:hidden}#sidebar{display:flex;flex-direction:column;width:280px;min-width:150px;max-width:600px;min-height:0;background:#fafafa;border-right:1px solid #ddd;overflow:hidden}#toc-header{padding:8px 12px;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:#666;border-bottom:1px solid #e0e0e0;flex-shrink:0}#toc-container{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;padding:6px 0}.toc-loading{padding:12px;color:#888;font-style:italic}#toc-container ul{list-style:none;padding:0;margin:0}#toc-container li{display:flex;flex-direction:column}#toc-container li>.toc-toggle,#toc-container li>.toc-spacer,#toc-container li>.toc-label{display:inline-block}#toc-container li{flex-direction:row;flex-wrap:wrap;align-items:flex-start}#toc-container li>ul{display:none;width:100%;padding-left:18px}#toc-container li.open>ul{display:block}.toc-toggle{flex-shrink:0;width:18px;font-size:10px;cursor:pointer;color:#888;padding:5px 2px;user-select:none}.toc-toggle:hover{color:#333}.toc-spacer{flex-shrink:0;width:18px}.toc-label{flex:1;padding:4px 8px 4px 2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;color:#333;cursor:default}.toc-label.toc-link{cursor:pointer;color:#1565c0}.toc-label.toc-link:hover{text-decoration:underline;background:#e8f0fe;border-radius:3px}.toc-label.active{background:#1565c0;color:#fff;border-radius:3px}.toc-label.active:hover{background:#0f4a86;color:#fff;text-decoration:none}#resizer{width:2px;cursor:col-resize;background:#ddd;transition:background .15s,box-shadow .12s;flex-shrink:0;position:relative}#resizer:before{content:"";position:absolute;inset:0 -9px;background:transparent;cursor:col-resize}#resizer:hover,#resizer:active{background:#2196f3;box-shadow:0 0 0 1px #2196f314 inset}#content{flex:1;min-height:0;min-width:0;overflow:hidden;position:relative}#content-frame{width:100%;height:100%;border:none;background:#fff}#content-html{background:#fff;min-height:0}.chm-host,.chm-host *{all:revert}.chm-host{display:block;width:100%;height:100%;min-height:0}.icon,.toc-icon{vertical-align:middle;display:inline-block}.icon{width:18px;height:18px}.btn.icon-btn svg,.icon,.toc-icon{width:18px;height:18px}.btn.icon-btn svg path,.icon path,.toc-icon path{stroke:currentColor;fill:none}.toc-toggle{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;margin-right:6px}.toc-spacer{display:inline-block;width:20px;height:20px;margin-right:6px}.toc-toggle .toc-icon{transition:transform .18s cubic-bezier(.4,0,.2,1);transform-origin:50% 50%;display:block}#toc-container li.open>.toc-toggle .toc-icon,.toc-toggle[aria-expanded=true] .toc-icon{transform:rotate(90deg)}
+
+</style>
+</head>
+<body>
+  <!-- Top toolbar (no Open control in plugin mode) -->
+  <header id="toolbar">
+    <div id="toolbar-left">
+      <button id="back-btn" class="btn icon-btn" disabled title="Back" aria-label="Back">
+        <svg class="icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true" focusable="false" xmlns="http://www.w3.org/2000/svg">
+          <path d="M15 6 L9 12 L15 18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+        </svg>
+      </button>
+      <button id="fwd-btn"  class="btn icon-btn" disabled title="Forward" aria-label="Forward">
+        <svg class="icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true" focusable="false" xmlns="http://www.w3.org/2000/svg">
+          <path d="M9 6 L15 12 L9 18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+        </svg>
+      </button>
+    </div>
+    <span id="title" class="toolbar-title">chm2html</span>
+    <div id="toolbar-right">
+      <div id="status" hidden></div>
+    </div>
+  </header>
+
+  <!-- Welcome hidden in plugin mode (host will supply file) -->
+  <div id="welcome" hidden>
+    <div id="drop-zone">
+      <div class="drop-icon">📄</div>
+      <p class="drop-primary">Drop a <strong>.chm</strong> file here</p>
+      <p class="drop-secondary">or</p>
+      <label class="btn btn-large" id="open-btn-welcome" for="file-input" style="cursor:pointer">Choose file…</label>
+    </div>
+  </div>
+
+  <!-- Main viewer (visible) -->
+  <div id="viewer">
+    <div id="sidebar">
+      <div id="toc-header">Contents</div>
+      <div id="toc-container"></div>
+    </div>
+    <div id="resizer"></div>
+    <div id="content">
+      <div id="content-html" tabindex="0" style="width:100%;height:100%;outline:none;overflow:auto;"></div>
+    </div>
+  </div>
+
+  <!-- Hidden file input kept for compatibility (host may not use it) -->
+  <input id="file-input" type="file" accept=".chm" style="display:none" />
+

+</body>
+</html>