# Editing or renaming file names

**URL:** https://community.mp3tag.de/t/editing-or-renaming-file-names/10567
**Category:** Support
**Created:** [June 20, 2010, 12:29am UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567 "2010-06-20T00:29:46Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![markeh](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/m/f14d63/32.png) [@markeh](https://community.mp3tag.de/u/markeh)
#### Post date: [June 20, 2010, 12:29am UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567/1 "2010-06-20T00:29:46Z")

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I can't seem to get anything to work in changing file names. Neither replace, regular expressions, or format.

When I select what tag to edit, I'm given three choices:

%\_FILENAME%  
%\_FILENAME\_EXT%  
%FILENAME%

I'm not sure where these strings came from, but even a simple replace doesn't work choosing any of them.

I'm sure its something simple I'm missing. Hints or guidance requested.

WinXP, using Mp3tag v2.46a

thanks,

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### Author: ![dano](https://community.mp3tag.de/user_avatar/community.mp3tag.de/dano/32/6_2.png) [@dano](https://community.mp3tag.de/u/dano)
#### Post date: [June 20, 2010, 6:24am UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567/2 "2010-06-20T06:24:05Z")

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The correct field is \_FILENAME without any % signs.

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### Author: ![markeh](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/m/f14d63/32.png) [@markeh](https://community.mp3tag.de/u/markeh)
#### Post date: [June 20, 2010, 11:50pm UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567/3 "2010-06-20T23:50:59Z")

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yes... that works. Thanks.

Maybe a couple more questions:

= = Why does the field have a "\_" ?

= = I didn't make up the three other names. I'm sure they were somehow "suggested" by mp3tag. Do they have some other uses??

thnx again.

.

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### Author: ![DetlevD](https://community.mp3tag.de/user_avatar/community.mp3tag.de/detlevd/32/123_2.png) [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [June 21, 2010, 3:20am UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567/4 "2010-06-21T03:20:40Z")

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> [@markeh](#):
>
> ...= = Why does the field have a "\_" ...

Mp3tag provides some handling of computer or disk system related values as pseudo tag fields, which have a leading underline character, e. g. \_FILENAME.  
For more pseudo tag fields take a look into the Mp3tag help manual.

DD.20100621.0720.CEST

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### Author: ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:22pm UTC](https://community.mp3tag.de/t/editing-or-renaming-file-names/10567/5 "2026-02-09T12:22:27Z")

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