fix windows extensions (#1968)

ui/desktop/src/platform/windows/bin/README.md

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+# Windows-Specific Binaries
+
+This directory contains Windows-specific binaries and scripts that are only included during Windows builds.
+
+## Components
+
+### Node.js Installation
+- `install-node.cmd` - Script to check for and install Node.js if needed
+- `npx.cmd` - Wrapper script that ensures Node.js is installed and uses system npx
+
+### Windows Binaries
+- `*.dll` files - Required Windows dynamic libraries
+- `*.exe` files - Windows executables
+
+## Build Process
+
+These files are generated during the Windows build process by:
+1. `prepare-windows-npm.sh` - Creates Node.js installation scripts
+2. `copy-windows-dlls.js` - Copies all Windows-specific files to the output directory
+
+None of these files should be committed to the repository - they are generated fresh during each Windows build.

ui/desktop/src/platform/windows/bin/install-node.cmd

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+@echo off
+setlocal enabledelayedexpansion
+
+REM Check if Node.js is installed in Program Files
+if exist "C:\Program Files\nodejs\node.exe" (
+    echo Node.js found in Program Files
+    set "NODE_EXE=C:\Program Files\nodejs\node.exe"
+    goto :found
+)
+
+REM Check if Node.js is installed in Program Files (x86)
+if exist "C:\Program Files (x86)\nodejs\node.exe" (
+    echo Node.js found in Program Files (x86)
+    set "NODE_EXE=C:\Program Files (x86)\nodejs\node.exe"
+    goto :found
+)
+
+echo Node.js not found in standard locations, installing...
+
+REM Download Node.js MSI installer
+powershell -Command "& {[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; Invoke-WebRequest -Uri '%1' -OutFile '%TEMP%\node-setup.msi'}"
+
+REM Install Node.js silently
+msiexec /i "%TEMP%\node-setup.msi" /qn
+
+REM Wait a bit for installation to complete
+timeout /t 5 /nobreak
+
+REM Clean up
+del "%TEMP%\node-setup.msi"
+
+REM Set path to installed Node.js
+set "NODE_EXE=C:\Program Files\nodejs\node.exe"
+
+:found
+echo Using Node.js: %NODE_EXE%
+exit /b 0

ui/desktop/src/platform/windows/bin/jbang.cmd

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+@echo off
+"%~dp0\jbang" %*

ui/desktop/src/platform/windows/bin/npx.cmd

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+@ECHO OFF
+SETLOCAL EnableDelayedExpansion
+
+SET "SCRIPT_DIR=%~dp0"
+
+REM Try to find Node.js in standard locations first
+if exist "C:\Program Files\nodejs\npx.cmd" (
+    "C:\Program Files\nodejs\npx.cmd" %*
+    exit /b %errorlevel%
+)
+
+if exist "C:\Program Files (x86)\nodejs\npx.cmd" (
+    "C:\Program Files (x86)\nodejs\npx.cmd" %*
+    exit /b %errorlevel%
+)
+
+REM If Node.js not found, run installer
+call "%SCRIPT_DIR%install-node.cmd" "https://nodejs.org/dist/v23.10.0/node-v23.10.0-x64.msi"
+if errorlevel 1 (
+    echo Failed to install Node.js
+    exit /b 1
+)
+
+REM Try using the newly installed Node.js
+if exist "C:\Program Files\nodejs\npx.cmd" (
+    "C:\Program Files\nodejs\npx.cmd" %*
+    exit /b %errorlevel%
+)
+
+echo Failed to find npx after Node.js installation
+exit /b 1