diff --git a/cli/src/commands/script/script.ts b/cli/src/commands/script/script.ts
index 1f8bdd90a2..c699e3d58f 100644
--- a/cli/src/commands/script/script.ts
+++ b/cli/src/commands/script/script.ts
@@ -262,6 +262,20 @@ export async function findResourceFile(path: string) {
   return validCandidates[0];
 }
 
+// The separator is whatever the local filesystem uses, so both are accepted:
+// on Windows these paths reach us as `my_script__mod\script.yaml`.
+const MODULE_ENTRY_META_RE = /([\\/])script\.(yaml|json|lock)$/;
+
+/**
+ * Whether a path is a module folder's own metadata file (`__mod/script.yaml`).
+ * `isModuleEntryPoint` already pins the file to `script.*` directly under
+ * `__mod/`, so this only narrows it to the metadata extensions: a `script.yaml`
+ * nested deeper in the module tree is a module file, not the script's metadata.
+ */
+function isModuleEntryMetadata(p: string): boolean {
+  return isModuleEntryPoint(p) && MODULE_ENTRY_META_RE.test(p);
+}
+
 export async function handleScriptMetadata(
   path: string,
   workspace: Workspace,
@@ -276,14 +290,7 @@ export async function handleScriptMetadata(
   const isFlatMeta = path.endsWith(".script.json") ||
     path.endsWith(".script.yaml") ||
     path.endsWith(".script.lock");
-  // Folder layout: my_script__mod/script.yaml. Only the entry point counts —
-  // a script.yaml nested deeper in the module tree is a module file, not the
-  // script's metadata.
-  const isFolderMeta = !isFlatMeta && isModuleEntryPoint(path) && (
-    path.endsWith("/script.yaml") ||
-    path.endsWith("/script.json") ||
-    path.endsWith("/script.lock")
-  );
+  const isFolderMeta = !isFlatMeta && isModuleEntryMetadata(path);
   if (isFlatMeta || isFolderMeta) {
     const contentPath = await findContentFile(path);
     return handleFile(
@@ -884,12 +891,10 @@ export class UnresolvableScriptContentFileError extends Error {}
 
 export async function findContentFile(filePath: string) {
   // Folder layout: __mod/script.yaml -> __mod/script.ts
-  const isModuleFolderMeta =
-    isModuleEntryPoint(filePath) &&
-    (filePath.endsWith("/script.yaml") || filePath.endsWith("/script.json") || filePath.endsWith("/script.lock"));
+  const isModuleFolderMeta = isModuleEntryMetadata(filePath);
   const toCandidate = (ext: string) =>
     isModuleFolderMeta
-      ? filePath.replace(/\/script\.(yaml|json|lock)$/, "/script" + ext)
+      ? filePath.replace(MODULE_ENTRY_META_RE, "$1script" + ext)
       : filePath.endsWith("script.json")
       ? filePath.replace(".script.json", ext)
       : filePath.endsWith("script.lock")
diff --git a/cli/test/script_modules_unit.test.ts b/cli/test/script_modules_unit.test.ts
index da6b97d8c2..501d384141 100644
--- a/cli/test/script_modules_unit.test.ts
+++ b/cli/test/script_modules_unit.test.ts
@@ -350,6 +350,19 @@ describe("findContentFile", () => {
     );
   });
 
+  // `isModuleEntryPoint` treats `\` as a separator on every platform, so
+  // findContentFile must too or it rejects every Windows module path. Runnable
+  // on POSIX because there the backslash is merely part of the file name.
+  test("resolves a module entry point written with a backslash separator", async () => {
+    const meta = path.join(tempDir, "my_script__mod") + "\\script.yaml";
+    const content = path.join(tempDir, "my_script__mod") + "\\script.ts";
+    fs.mkdirSync(path.dirname(meta), { recursive: true });
+    fs.writeFileSync(content, "export async function main() {}\n");
+    fs.writeFileSync(meta, "summary: ''\n");
+
+    expect(await findContentFile(meta)).toBe(content);
+  });
+
   // sync push catches UnresolvableScriptContentFileError to record the change as
   // failed and carry on; any other error aborts the whole push, so every branch
   // that simply cannot pair a metadata file with one script file must use it.
diff --git a/cli/test/sync_push_script_metadata_only.test.ts b/cli/test/sync_push_script_metadata_only.test.ts
index 40e65efd5f..5ef01ae049 100644
--- a/cli/test/sync_push_script_metadata_only.test.ts
+++ b/cli/test/sync_push_script_metadata_only.test.ts
@@ -74,7 +74,8 @@ test(
         tempDir,
       );
       expect(result.code).toBe(1);
-      expect(result.stdout + result.stderr).toContain(
+      // The push echoes local paths with the platform separator (`\` on Windows).
+      expect((result.stdout + result.stderr).replaceAll("\\", "/")).toContain(
         "f/test/orphan.script.yaml",
       );