diff --git a/packages/electron-builder-squirrel-windows/src/SquirrelWindowsTarget.ts b/packages/electron-builder-squirrel-windows/src/SquirrelWindowsTarget.ts
index 178c4657aef..a78509c49a1 100644
--- a/packages/electron-builder-squirrel-windows/src/SquirrelWindowsTarget.ts
+++ b/packages/electron-builder-squirrel-windows/src/SquirrelWindowsTarget.ts
@@ -161,18 +161,76 @@ export default class SquirrelWindowsTarget extends Target {
     fs.copyFileSync(path.join(vendorDirectory, `7z-${resolvedArch}.dll`), path.join(vendorDirectory, "7z.dll"))
   }
 
-  private async createNuspecTemplateWithProjectUrl() {
+  private async createNuspecTemplateWithProjectUrl(additionalFiles: { src: string; target: string }[]) {
     const templatePath = path.resolve(__dirname, "..", "template.nuspectemplate")
     const projectUrl = await this.packager.appInfo.computePackageUrl()
+
+    // Always create a customized template to include additionalFiles
+    const nuspecTemplate = await this.packager.info.tempDirManager.getTempFile({ prefix: "template", suffix: ".nuspectemplate" })
+    let templateContent = await fs.promises.readFile(templatePath, "utf8")
+
+    // Add project URL if available
     if (projectUrl != null) {
-      const nuspecTemplate = await this.packager.info.tempDirManager.getTempFile({ prefix: "template", suffix: ".nuspectemplate" })
-      let templateContent = await fs.promises.readFile(templatePath, "utf8")
       const searchString = "<copyright><%- copyright %></copyright>"
       templateContent = templateContent.replace(searchString, `${searchString}\n    <projectUrl>${projectUrl}</projectUrl>`)
-      await fs.promises.writeFile(nuspecTemplate, templateContent)
-      return nuspecTemplate
     }
-    return templatePath
+
+    // Replace the additionalFiles loop with the actual files
+    if (additionalFiles.length > 0) {
+      const additionalFilesContent = additionalFiles.map(f => `    <file src="${f.src}" target="${f.target}" />`).join("\n")
+      templateContent = templateContent.replace('<% file src="additionalFiles.src" target="additionalFiles.target" / %>', additionalFilesContent)
+    } else {
+      templateContent = templateContent.replace('<% file src="additionalFiles.src" target="additionalFiles.target" / %>', "")
+    }
+
+    await fs.promises.writeFile(nuspecTemplate, templateContent)
+    return nuspecTemplate
+  }
+
+  private async getAdditionalFiles(appOutDir: string) {
+    const files = await fs.promises.readdir(appOutDir, { withFileTypes: true })
+    const appExe = `${this.exeName}.exe`
+
+    const additionalFiles = files.filter(f => {
+      if (f.isDirectory()) {
+        // Filter out directories already included in template
+        return f.name !== "resources" && f.name !== "locales"
+      }
+
+      // Filter out files already included in template.nuspectemplate
+      const fileName = f.name
+
+      // Files explicitly included in template
+      if (
+        fileName.endsWith(".bin") ||
+        fileName.endsWith(".dll") ||
+        fileName.endsWith(".pak") ||
+        fileName.endsWith(".exe.config") ||
+        fileName.endsWith(".exe.sig") ||
+        fileName.endsWith("_ExecutionStub.exe") ||
+        fileName === "icudtl.dat" ||
+        fileName === "Squirrel.exe" ||
+        fileName === "LICENSE.electron.txt" ||
+        fileName === "LICENSES.chromium.html" ||
+        fileName === appExe
+      ) {
+        return false
+      }
+      return true
+    })
+
+    return additionalFiles.map(f => {
+      if (f.isDirectory()) {
+        return {
+          src: `${f.name}\\**`,
+          target: `lib\\net45\\${f.name}`,
+        }
+      }
+      return {
+        src: f.name,
+        target: `lib\\net45\\${f.name}`,
+      }
+    })
   }
 
   async computeEffectiveDistOptions(appDirectory: string, outputDirectory: string, setupFile: string): Promise<SquirrelOptions> {
@@ -189,6 +247,7 @@ export default class SquirrelWindowsTarget extends Target {
       }
     }
 
+    const additionalFiles = await this.getAdditionalFiles(appDirectory)
     checkConflictingOptions(this.options)
     const appInfo = packager.appInfo
     const options: SquirrelOptions = {
@@ -200,7 +259,7 @@ export default class SquirrelWindowsTarget extends Target {
       description: appInfo.description,
       exe: `${appInfo.productFilename || this.options.name || appInfo.productName}.exe`,
       authors: appInfo.companyName || "",
-      nuspecTemplate: await this.createNuspecTemplateWithProjectUrl(),
+      nuspecTemplate: await this.createNuspecTemplateWithProjectUrl(additionalFiles),
       iconUrl,
       copyright: appInfo.copyright,
       noMsi: !this.options.msi,
diff --git a/packages/electron-builder-squirrel-windows/template.nuspectemplate b/packages/electron-builder-squirrel-windows/template.nuspectemplate
index 688a369d20d..f7442db51a3 100644
--- a/packages/electron-builder-squirrel-windows/template.nuspectemplate
+++ b/packages/electron-builder-squirrel-windows/template.nuspectemplate
@@ -25,8 +25,6 @@
     <file src="LICENSE.electron.txt" target="lib\net45\LICENSE.electron.txt" />
     <file src="LICENSES.chromium.html" target="lib\net45\LICENSES.chromium.html" />
     <file src="<%- exe %>" target="lib\net45\<%- exe %>" />
-    <% additionalFiles.forEach(function(f) { %>
-    <file src="<%- f.src %>" target="<%- f.target %>" />
-    <% }); %>
+    <% file src="additionalFiles.src" target="additionalFiles.target" / %>
   </files>
 </package>
\ No newline at end of file
diff --git a/test/snapshots/windows/squirrelWindowsTest.js.snap b/test/snapshots/windows/squirrelWindowsTest.js.snap
index 523e46827a9..6971ae4dd52 100644
--- a/test/snapshots/windows/squirrelWindowsTest.js.snap
+++ b/test/snapshots/windows/squirrelWindowsTest.js.snap
@@ -272,6 +272,7 @@ exports[`squirrel.windows > squirrel window x64 msi 2`] = `
   "lib/net45/d3dcompiler_47.dll",
   "lib/net45/ffmpeg.dll",
   "lib/net45/icudtl.dat",
+  "lib/net45/index.html",
   "lib/net45/libEGL.dll",
   "lib/net45/libGLESv2.dll",
   "lib/net45/LICENSE.electron.txt",
diff --git a/test/src/windows/squirrelWindowsTest.ts b/test/src/windows/squirrelWindowsTest.ts
index ba7e5b72b36..f5d273c35d4 100644
--- a/test/src/windows/squirrelWindowsTest.ts
+++ b/test/src/windows/squirrelWindowsTest.ts
@@ -77,6 +77,7 @@ describe("squirrel.windows", { sequential: true }, () => {
           squirrelWindows: {
             msi: true,
           },
+          extraFiles: ["index.html"],
         },
       },
       { signedWin: true }