You can open file & folders automatically when Windows 11/10 starts by using Startup folder or Task Scheduler. Here is a complete tutorial.

But it is not possible to know what contains in a DAT file. If a DAT file contains a video, audio, or PDF, you need to open it with respective applications, like a Media Player or a PDF Reader.

Adobe Reader is a great tool to open and edit your PDF files. It also gives you the ability to take a screenshot of said files. This article will show you how to take a screenshot of a PDF file or ...

Learn how to use tools to create, annotate, and extract text from a PDF on a Chromebook.

Gimp is normally used to create or manipulate images files, but can also work with PDFs if you understand how it works and what it's limits are.