Hi there! I understand you're having trouble opening your Xmind file and getting an error message saying "not your fault but something went wrong." Let's figure this out together.

To start, could you let me know:
1. Are you trying to open a file you created on your Windows 10 machine or did you receive it from someone else?
2. Is this happening with just one specific file or with multiple files?
3. Have you tried reopening the app or restarting your computer?
4. Are you using the latest version of Xmind?

Once I have these details, I can guide you step-by-step more effectively. Meanwhile, here are some initial steps you can try:

1. Restart Xmind: Close the app completely and open it again to see if the file opens.
2. Check File Location: Make sure the file is stored locally (not on a network drive or cloud service that might be disconnected).
3. Try Opening a Different File: See if other Xmind files open properly to isolate if the issue is with the app or the particular file.
4. Update Xmind: Make sure you have the latest version installed, as updates fix known bugs.
5. Open a Backup: If you enabled autosave or backups, try opening a previous version of the file.

If the file still won’t open, it could be corrupted. At that point, I can help you with some recovery methods or check if there are any server-related issues.

Let me know the details or how these steps go!