diff --git a/src/resources/extensions/gsd/auto.ts b/src/resources/extensions/gsd/auto.ts
index 05f8ff921..1b8d4fd47 100644
--- a/src/resources/extensions/gsd/auto.ts
+++ b/src/resources/extensions/gsd/auto.ts
@@ -126,6 +126,7 @@ import {
 import { setLogBasePath, logWarning, logError } from "./workflow-logger.js";
 import { homedir } from "node:os";
 import { join } from "node:path";
+import { pathToFileURL } from "node:url";
 import { readFileSync, existsSync, mkdirSync, writeFileSync, unlinkSync } from "node:fs";
 import { atomicWriteSync } from "./atomic-write.js";
 import {
@@ -1341,7 +1342,7 @@ export async function startAuto(
     const agentDir = process.env.GSD_CODING_AGENT_DIR || join(process.env.GSD_HOME || homedir(), ".gsd", "agent");
     const pkgRoot = process.env.GSD_PKG_ROOT;
     const resourceLoaderPath = pkgRoot
-      ? join(pkgRoot, "dist", "resource-loader.js")
+      ? pathToFileURL(join(pkgRoot, "dist", "resource-loader.js")).href
       : new URL("../../../resource-loader.js", import.meta.url).href;
     const { initResources } = await import(resourceLoaderPath);
     initResources(agentDir);
diff --git a/src/resources/extensions/gsd/tests/resource-loader-import-path.test.ts b/src/resources/extensions/gsd/tests/resource-loader-import-path.test.ts
index e8a5bfe85..0908d12d6 100644
--- a/src/resources/extensions/gsd/tests/resource-loader-import-path.test.ts
+++ b/src/resources/extensions/gsd/tests/resource-loader-import-path.test.ts
@@ -22,16 +22,17 @@ describe("resource-loader import path", () => {
     );
   });
 
-  test("uses createRequire to resolve resource-loader from package root", () => {
-    // The fix uses createRequire to find gsd-pi/package.json, then imports
-    // dist/resource-loader.js from there — works in both source and deployed.
+  test("uses GSD_PKG_ROOT to resolve resource-loader from package root", () => {
+    // The fix uses GSD_PKG_ROOT (set by loader.ts) to construct an absolute
+    // file URL to dist/resource-loader.js — works in both source and deployed,
+    // and on Windows where raw paths fail with ERR_UNSUPPORTED_ESM_URL_SCHEME.
     assert.ok(
-      autoSrc.includes('createRequire(import.meta.url)'),
-      "auto.ts should use createRequire to resolve resource-loader",
+      autoSrc.includes('process.env.GSD_PKG_ROOT'),
+      "auto.ts should use GSD_PKG_ROOT to resolve resource-loader",
     );
     assert.ok(
-      autoSrc.includes('resolve("gsd-pi/package.json")'),
-      "auto.ts should resolve gsd-pi package root via package.json",
+      autoSrc.includes('pathToFileURL'),
+      "auto.ts should convert path to file URL for cross-platform import()",
     );
   });
 });
diff --git a/src/tests/auto-resume-resource-loader.test.ts b/src/tests/auto-resume-resource-loader.test.ts
index a90340386..9926e87c2 100644
--- a/src/tests/auto-resume-resource-loader.test.ts
+++ b/src/tests/auto-resume-resource-loader.test.ts
@@ -33,10 +33,11 @@ test("auto.ts resume uses GSD_PKG_ROOT for resource-loader import, not bare rela
     "auto.ts resource-loader import must use the computed resourceLoaderPath variable, not a hardcoded relative path",
   );
 
-  // The resourceLoaderPath must be constructed from GSD_PKG_ROOT
+  // The resourceLoaderPath must be constructed from GSD_PKG_ROOT via pathToFileURL
+  // (raw filesystem paths break on Windows with ERR_UNSUPPORTED_ESM_URL_SCHEME)
   assert.ok(
-    autoSrc.includes('join(pkgRoot, "dist", "resource-loader.js")'),
-    "auto.ts must construct resourceLoaderPath from pkgRoot + dist/resource-loader.js",
+    autoSrc.includes("pathToFileURL(join(pkgRoot,"),
+    "auto.ts must convert the constructed path to a file URL for cross-platform import()",
   );
 });