Hi, I just upgraded to 3.34.1 and now whenever I try to change a tag in any of my files, I see the error message "Cannot Write File..." (followed by my file name). Daniel

OK, thanks. Access denied looks quite definitive. Can you try disabling Ransomware protection (Protected Folder Access) in Windows Defender? It's possible that this is revoking Mp3tag's access to the file after it acquired exclusive write access and started writing metadata.

Follow-Up: I uninstalled 3.34.1 and installed 3.34... this fixed the problem.

... and what happens, if you update again?

I just tried it - when I update, the problem returns.

Can you try those steps with v3.34.1 to gather some more information: Open Mp3tag and choose File → Open configuration folder Reproduce the error Close Mp3tag Open Mp3tagError.log from the config folder and check if there is more info regarding the error

Mp3tag v3.34.1 - 12.05.2026 - 10:46:32 \-------------------------------------------------------------------------------- OS-Version: Windows 11 (build 26200), 64-bit \-------------------------------------------------------------------------------- Build: May 7 2026 17:01:45 (64-bit) \--------…

That is EXACTLY it!! But now what? In order to use 3.34.1, I have to leave ransomware turned off?? I'd rather just go back to using 3.34.

I discovered you can allow a specific app through controlled folder access. I did that for mp3tag and now my problem is 100% resolved! Thank you, Florian, for the help!

Hi! Same problem here with Windows 10. But Windows Defender Ransomware Protection is off. No hints in Mp3tagError.log.

Mp3tag Community

After 3.34.1, I can no longer change tags

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