# Cannot tag m4b file
**URL:** https://community.mp3tag.de/t/cannot-tag-m4b-file/58507
**Category:** Support
**Created:** [September 18, 2022, 4:59pm UTC](https://community.mp3tag.de/t/cannot-tag-m4b-file/58507 "2022-09-18T16:59:12Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@DarthDobber](https://community.mp3tag.de/u/DarthDobber)
#### Post date: [September 18, 2022, 4:59pm UTC](https://community.mp3tag.de/t/cannot-tag-m4b-file/58507/1 "2022-09-18T16:59:12Z")
I have gone through multiple threads concerning this issue and I am still at a loss for a solution. The problem is that I have one m4b file that gives the "File cannot be opened for writing" error. Here are the details:
- I am able to tag other files just fine
- I am able to tag this file in Windows Explorer and other programs such as Picard and Foobar2000
- The file owner is set to my user
- The file permissions are set to 'full control, modify, read&execute, read, and write'
- I have split the file into multiple different mp3 files and get the same error when attempting to tag each individual file
- I have cleared all the existing tags and attempted to tag using mp3tag
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [September 18, 2022, 5:05pm UTC](https://community.mp3tag.de/t/cannot-tag-m4b-file/58507/2 "2022-09-18T17:05:06Z")
See 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 …
or here:
> [@Tags not saved in mp4 files](https://community.mp3tag.de/t/tags-not-saved-in-mp4-files/14151):
>
> I'm trying to add titles, album, artist tags to a set of mp4 files. No error shows up when I tell it to save the tags, but the files do not have any tags in them. As a result this software seems totally useless. What am I doing wrong? I've tried several versions of mp3tag including 2.53 with no change in behavior. I don't see any way to make it work and there is no documentation pointing me to what I'm doing wrong.
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:29pm UTC](https://community.mp3tag.de/t/cannot-tag-m4b-file/58507/3 "2026-02-09T12:29:55Z")