A free program for Android, by Baj.

This free tool is designed to view, edit, and manage the contents of any text-based data file, including those associated with an app or software. The Dat File Opener & Viewer app is a free, user-friendly text editor that works on all Android devices.

You’ll find that this tool is ideal for developers, who can use it to create, edit, and manage their data files, as well as for users who simply want to view, edit, and manage their data files.

Moreover, you can use this app to save your modified .dat files to your Android device.