Hi, DolfEvG!
Thanks for reaching Microsoft Community and posting your concerns here. We are sorry to learn you have issues with your File Explorer in your Surface Pro X. May we know if this happens to all files? For the meantime, please perform the following troubleshooting steps.
Check for Windows Update:
Go to Settings > Update & Security > Windows Update > Check for Updates
Please restart your device to apply the updates.
Kindly visit this page to be guided on the steps to go through the System File Checker in Windows 10.
You may also force shutdown the device and restart it.
- Press and hold the power button until the screen turns off (about 10 seconds), then release the power button.
- Press and release the power button to turn your Surface back on. You should see the Microsoft logo.
If that doesn't work, here's how to make sure your Surface turns off completely:
Press and hold down the power button until your Surface restarts and you see the Windows logo screen (about 20 seconds), then release the power button.
If this answers your question, please let our Community know by marking this post as an answer. Otherwise, don't hesitate to respond to this thread if there’s anything else that needs to be addressed.
Kind regards,
Janette_Z