diff --git a/packages/web-templates/build.mjs b/packages/web-templates/build.mjs
index c01646232..eb7bd0d25 100644
--- a/packages/web-templates/build.mjs
+++ b/packages/web-templates/build.mjs
@@ -23,10 +23,14 @@ const assetBuilds = [
 
 const runCommand = ({ command, args, cwd, label }) =>
   new Promise((resolve, reject) => {
-    const child = spawn(command, args, {
+    const useShell = process.platform === 'win32';
+    // On Windows, quote the command path to handle spaces (e.g., "C:\Program Files\nodejs\node.exe")
+    const quotedCommand = useShell ? `"${command}"` : command;
+
+    const child = spawn(quotedCommand, args, {
       cwd,
       stdio: 'inherit',
-      shell: process.platform === 'win32',
+      shell: useShell,
     });
 
     child.on('error', reject);
diff --git a/scripts/dev.js b/scripts/dev.js
index 8432a32ce..32f4a2280 100644
--- a/scripts/dev.js
+++ b/scripts/dev.js
@@ -15,18 +15,15 @@
  */
 
 import { spawn } from 'node:child_process';
-import { dirname, join, resolve } from 'node:path';
+import { dirname, join } from 'node:path';
 import { fileURLToPath, pathToFileURL } from 'node:url';
 import { writeFileSync, mkdtempSync, rmSync } from 'node:fs';
-import { tmpdir } from 'node:os';
+import { tmpdir, platform } from 'node:os';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const root = join(__dirname, '..');
 const cliPackageDir = join(root, 'packages', 'cli');
 
-// Resolve tsx from node_modules
-const tsxPath = resolve(root, 'node_modules', '.bin', 'tsx');
-
 // Entry point for the CLI
 const cliEntry = join(cliPackageDir, 'index.ts');
 
@@ -79,12 +76,16 @@ const env = {
   NODE_OPTIONS: `${existingNodeOptions} ${importFlag}`.trim(),
 };
 
-const nodeArgs = [tsxPath, cliEntry, ...process.argv.slice(2)];
+// On Windows, use tsx.cmd; on Unix, use tsx directly
+const isWin = platform() === 'win32';
+const tsxCmd = isWin ? 'tsx.cmd' : 'tsx';
+const tsxArgs = [cliEntry, ...process.argv.slice(2)];
 
-const child = spawn('node', nodeArgs, {
+const child = spawn(tsxCmd, tsxArgs, {
   stdio: 'inherit',
   env,
   cwd: process.cwd(),
+  shell: isWin, // Use shell on Windows to resolve .cmd files
 });
 
 child.on('error', (err) => {