Hey there, OstinatoFreak,
Welcome to our Microsoft Community.
For the problem that you still can't write to the C:\ drive from the batch file, we could try changing the permissions on the C drive to EVERYONE, the following steps are given:
- Right click Local Disk(C:), select Advanced under Security.
- Change > Type everyone
For the issue you mentioned about the jump list not working, you can try to rebuild the jump list as follows:
Note: This steps will reset the list and delete all the items stored in it:
1.OpenFile Explorer (Windows key + E).
**2.**Navigate to the following location:
%AppData%\Microsoft\Windows\Recent\AutomaticDestinations
3.Right-click on the following file and clickDelete.
1b4dd67f29cb1962.automaticDestinations-ms
4. Restart your computer to apply the changes.
I also found a thread with a similar problem to yours, which you can also refer to:
Jump Lists not working in Windows 10 - Microsoft Community
By the way, regarding your question about certain functions you want to achieve with a batch file, the best place to get help with it is Microsoft Learn(English only), which aims to support more advanced users like you.
Here is a link to the forum where you can raise specific scenarios and share your idea to help solve the problem.
Thank you for your time and effort working on this issue. If there are any updates or changes, please do not hesitate to let me know.
Have a nice day and stay safe!
Sincerely,
Olivia - MSFT | Microsoft Community Support Specialist