# MP3tag v2.51 doesn't change any .AAC tag field. Why?

**URL:** https://community.mp3tag.de/t/mp3tag-v2-51-doesnt-change-any-aac-tag-field-why/13507
**Category:** Support
**Created:** [June 1, 2012, 4:53pm UTC](https://community.mp3tag.de/t/mp3tag-v2-51-doesnt-change-any-aac-tag-field-why/13507 "2012-06-01T16:53:47Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![ShadowDragon](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/bc79bd/32.png) [@ShadowDragon](https://community.mp3tag.de/u/ShadowDragon)
#### Post date: [June 4, 2012, 5:14am UTC](https://community.mp3tag.de/t/mp3tag-v2-51-doesnt-change-any-aac-tag-field-why/13507/3 "2012-06-04T05:14:12Z")

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> [@LaurenBacall](#):
>
> If your file does actually have the .AAC extension then it's a raw AAC file. The file needs to be inside what's known as a 'container' format, such as Mp4.
> 
> Mp4 containers store the .AAC inside of them, and only then are able to be tagged and played on devices.
> 
> Typical Mp4 containers will have the extension '.mp4', or '.m4a' at the end of the filename.
> 
> Here's how to add a .AAC file to a proper Mp4 container:
> 
> 1. Download [YAMB v2.1](http://www.videohelp.com/download/Yamb-2.1.0.0_beta2_setup.exe).
> 
> 2. In the 'Creation' tab select the 'Click to create an Mp4 file....' item.
> 
> 3. Click the 'Add' button and select your .AAC file.
> 
> 4. Select the Output folder, the click the 'Next' button to complete.
> 
> Hope this helps 🙂 .

But WinAmp 5.623 stores everything correctly, if I rewrite tags in .AAC... Then why does it happens?

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