# Change case of file extension
**URL:** https://community.mp3tag.de/t/change-case-of-file-extension/11551
**Category:** Support
**Created:** [February 6, 2011, 8:51pm UTC](https://community.mp3tag.de/t/change-case-of-file-extension/11551 "2011-02-06T20:51:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@theonlyrick](https://community.mp3tag.de/u/theonlyrick)
#### Post date: [February 6, 2011, 8:51pm UTC](https://community.mp3tag.de/t/change-case-of-file-extension/11551/1 "2011-02-06T20:51:41Z")
As always, thanks Florian for a tip-top program. The only problem is that MP3Tag really feeds my OCD habit... 🙂
Anyway, I would like to change all JPGs on my PC to jpgs.
I've added jpg as an extension that MP3Tag 'cares about'.
Where do I tell it not to ignore extensions in general?
Thanks,
Richard
---
### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [February 6, 2011, 9:42pm UTC](https://community.mp3tag.de/t/change-case-of-file-extension/11551/2 "2011-02-06T21:42:04Z")
> [@theonlyrick](#):
>
> ... Anyway, I would like to change all JPGs on my PC to jpgs. I've added jpg as an extension that MP3Tag 'cares about'.
> ...
I understand, that you want to use Mp3tag to change the file extension of non music files from upper case to lower case.
Basically you should do such task with a dedicated file manager, for example Total Commander.
But you can try Mp3tag's action "Replace using Regular Expression" on the pseudo tag-field \_FILENAME and see how it works.
DD.20110206.2343.CET
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### Author:  [@theonlyrick](https://community.mp3tag.de/u/theonlyrick)
#### Post date: [February 6, 2011, 10:51pm UTC](https://community.mp3tag.de/t/change-case-of-file-extension/11551/3 "2011-02-06T22:51:32Z")
Vielen danke - that sorted it.
I think I was making things more complicated than I needed to.
Cheers,
Richard
> [@DetlevD](#):
>
> I understand, that you want to use Mp3tag to change the file extension of non music files from upper case to lower case.
>
> Basically you should do such task with a dedicated file manager, for example Total Commander.
> But you can try Mp3tag's action "Replace using Regular Expression" on the pseudo tag-field \_FILENAME and see how it works.
>
> DD.20110206.2343.CET
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:22pm UTC](https://community.mp3tag.de/t/change-case-of-file-extension/11551/4 "2026-02-09T12:22:53Z")