diff --git a/README.md b/README.md
index a60e1753..1a1f9576 100644
--- a/README.md
+++ b/README.md
@@ -385,6 +385,7 @@ nwbuild({
 
 ### Chores
 
+- chore: add Linux, MacOS and Windows fixtures
 - chore(docs): don't store JSDoc definitions in `typedef`s - get's hard to understand during development.
 - chore: annotate file paths as `fs.PathLike` instead of `string`.
 - chore(bld): factor out core build step
diff --git a/package.json b/package.json
index 46bdb9de..bb699cd4 100644
--- a/package.json
+++ b/package.json
@@ -47,8 +47,8 @@
     "test": "vitest run --coverage",
     "test:cov": "vitest --coverage.enabled true",
     "demo:bld": "node ./tests/fixtures/demo.js",
-    "demo:exe": "./tests/fixtures/out/nwapp.app/Contents/MacOS/nwapp",
-    "demo:cli": "nwbuild --mode=run --version=0.92.0 --flavor=sdk --glob=false --cacheDir=./node_modules/nw ./tests/fixtures/app"
+    "demo:exe": "./tests/fixtures/out/Demo.app/Contents/MacOS/Demo",
+    "demo:cli": "nwbuild --mode=run --flavor=sdk --glob=false --cacheDir=./node_modules/nw ./tests/fixtures/app"
   },
   "devDependencies": {
     "@eslint/js": "^9.12.0",
diff --git a/src/bld.js b/src/bld.js
index d2895854..9c11bfb2 100644
--- a/src/bld.js
+++ b/src/bld.js
@@ -133,7 +133,13 @@ async function bld({
   await fs.promises.cp(nwDir, outDir, { recursive: true, verbatimSymlinks: true });
 
   const files = await util.globFiles({ srcDir, glob });
-  const manifest = await util.getNodeManifest({ srcDir, glob });
+  let manifest = await util.getNodeManifest({ srcDir, glob });
+
+  /* Set `product_string` in manifest for MacOS. This is used in renaming the Helper apps. */
+  if (platform === 'osx') {
+    manifest.json.product_string = app.name;
+    await fs.promises.writeFile(manifest.path, JSON.stringify(manifest.json));
+  }
 
   if (glob) {
     for (let file of files) {
@@ -169,7 +175,7 @@ async function bld({
     typeof managedManifest === 'object' ||
     typeof managedManifest === 'string'
   ) {
-    await manageManifest({ nwPkg: manifest, managedManifest, outDir, platform });
+    await manageManifest({ nwPkg: manifest.json, managedManifest, outDir, platform });
   }
 
   if (platform === 'linux') {
diff --git a/src/index.js b/src/index.js
index 995a3227..b77986d4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -39,18 +39,21 @@ import util from './util.js';
 async function nwbuild(options) {
   let built;
   let releaseInfo = {};
-  let manifest = {};
+  let manifest = {
+    path: '',
+    json: undefined,
+  };
 
   try {
     // Parse options
     options = await util.parse(options, manifest);
 
     manifest = await util.getNodeManifest({ srcDir: options.srcDir, glob: options.glob });
-    if (typeof manifest?.nwbuild === 'object') {
-      options = manifest.nwbuild;
+    if (typeof manifest.json?.nwbuild === 'object') {
+      options = manifest.json.nwbuild;
     }
 
-    options = await util.parse(options, manifest);
+    options = await util.parse(options, manifest.json);
 
     //TODO: impl logging
 
diff --git a/src/util.js b/src/util.js
index 370d30ae..6ff94c64 100644
--- a/src/util.js
+++ b/src/util.js
@@ -136,25 +136,30 @@ async function globFiles({
  * @param  {object}             options         - node manifest options
  * @param  {string | string []} options.srcDir  - src dir
  * @param  {boolean}            options.glob    - glob flag
- * @returns {object}                             - Node manifest
+ * @returns {Promise.<{path: string, json: object}>}      - Node manifest
  */
 async function getNodeManifest({
   srcDir, glob
 }) {
-  let manifest;
+  let manifest = {
+    path: '',
+    json: undefined,
+  };
   let files;
   if (glob) {
     files = await globFiles({ srcDir, glob });
     for (const file of files) {
       if (path.basename(file) === 'package.json' && manifest === undefined) {
-        manifest = JSON.parse(await fs.promises.readFile(file));
+        manifest.path = file;
+        manifest.json = JSON.parse(await fs.promises.readFile(file));
       }
     }
   } else {
-    manifest = JSON.parse(await fs.promises.readFile(path.resolve(srcDir, 'package.json')));
+    manifest.path = path.resolve(srcDir, 'package.json');
+    manifest.json = JSON.parse(await fs.promises.readFile(path.resolve(srcDir, 'package.json')));
   }
 
-  if (manifest === undefined) {
+  if (manifest.json === undefined) {
     throw new Error('package.json not found in srcDir file glob patterns.');
   }
 
@@ -220,8 +225,11 @@ export const parse = async (options, pkg) => {
 
   options.app = options.app ?? {};
   options.app.name = options.app.name ?? pkg.name;
-  /* Remove special and control characters from app.name to mitigate potential path traversal. */
-  options.app.name = options.app.name.replace(/[<>:"/\\|?*\u0000-\u001F]/g, '');
+  /* Since the `parse` function is called twice, the first time `pkg` is `{}` and `options.app.name` is `undefined`. */
+  if (options.app.name) {
+    /* Remove special and control characters from app.name to mitigate potential path traversal. */
+    options.app.name = options.app.name.replace(/[<>:"/\\|?*\u0000-\u001F]/g, '');
+  }
   options.app.icon = options.app.icon ?? undefined;
 
   // TODO(#737): move this out
diff --git a/tests/fixtures/demo.js b/tests/fixtures/demo.js
index 1dd5455f..ae29dfee 100644
--- a/tests/fixtures/demo.js
+++ b/tests/fixtures/demo.js
@@ -9,7 +9,7 @@ await nwbuild({
   outDir: './tests/fixtures/out',
   glob: false,
   app: {
-    name: 'nwapp',
+    name: 'Demo',
     // MacOS options
     LSApplicationCategoryType: 'public.app-category.utilities',
     CFBundleIdentifier: 'io.nwutils.demo',