diff --git a/README.md b/README.md
index c086055..59af06f 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ For notarization, you need the following things:
 
 * `options` Object
   * `tool` String - The notarization tool to use, default is `notarytool`.  Can be `legacy` or `notarytool`. `notarytool` is substantially (10x) faster and `legacy` is deprecated and will **stop working** on November 1st 2023.
-  * `appPath` String - The absolute path to your `.app` file
+  * `appPath` String - The absolute path to your `.app`, `.dmg` or `.pkg` file
   * There are different options for each tool: Notarytool
     * There are three authentication methods available: user name with password:
       * `appleId` String - The username of your apple developer account
diff --git a/src/notarytool.ts b/src/notarytool.ts
index 6b43431..558c78b 100644
--- a/src/notarytool.ts
+++ b/src/notarytool.ts
@@ -49,19 +49,18 @@ export async function isNotaryToolAvailable() {
 export async function notarizeAndWaitForNotaryTool(opts: NotaryToolStartOptions) {
   d('starting notarize process for app:', opts.appPath);
   return await withTempDir(async dir => {
-    const fileExt = path.extname(opts.appPath);
-    let filePath;
-    if (fileExt === '.dmg' || fileExt === '.pkg') {
-      filePath = path.resolve(dir, opts.appPath);
-      d('attempting to upload file to Apple: ', filePath);
+    const parsedAppPath = path.parse(opts.appPath);
+    let filename = opts.appPath;
+    if (['.dmg', '.pkg'].includes(parsedAppPath.ext)) {
+      d('attempting to upload file to Apple: ', filename);
     } else {
-      filePath = path.resolve(dir, `${path.parse(opts.appPath).name}.zip`);
-      d('zipping application to:', filePath);
+      filename = path.resolve(dir, `${parsedAppPath.name}.zip`);
+      d('zipping application to:', filename);
       const zipResult = await spawn(
         'ditto',
-        ['-c', '-k', '--sequesterRsrc', '--keepParent', path.basename(opts.appPath), filePath],
+        ['-c', '-k', '--sequesterRsrc', '--keepParent', parsedAppPath.base, filename],
         {
-          cwd: path.dirname(opts.appPath),
+          cwd: parsedAppPath.dir,
         },
       );
       if (zipResult.code !== 0) {
@@ -75,7 +74,7 @@ export async function notarizeAndWaitForNotaryTool(opts: NotaryToolStartOptions)
     const notarizeArgs = [
       'notarytool',
       'submit',
-      filePath,
+      filename,
       ...authorizationArgs(opts),
       '--wait',
       '--output-format',