# Can't access MP4 files

**URL:** https://community.mp3tag.de/t/cant-access-mp4-files/71094
**Category:** Support
**Created:** [April 21, 2026, 7:21pm UTC](https://community.mp3tag.de/t/cant-access-mp4-files/71094 "2026-04-21T19:21:13Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [April 21, 2026, 7:27pm UTC](https://community.mp3tag.de/t/cant-access-mp4-files/71094/2 "2026-04-21T19:27:46Z")

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Do you see an exclamation mark in the first column of the file list?  
That would mean that MP3tag considers the file to be corrupt.  
See also here:

> [@How to check files for errors?](https://community.mp3tag.de/t/how-to-check-files-for-errors/44633):
>
> It’s required and often helps to reduce support cycles to check files for errors before filing a bug report. Symptoms of erroneous files are often missing or wrong bitrate or length audible blips or skips tags seem to be sticky and cannot be removed There are some really good tools to check the files for errors, namely MP3 Diags — identifies many different issues in MP3 files Website: [http://mp3diags.sourceforge.net](http://mp3diags.sourceforge.net) Download: [MP3 Diags - Getting MP3 Diags](http://mp3diags.sourceforge.net/010_getting_the_program.html#binWindows) If the font size in MP3 Diags is …

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