# Unnecessary files are modified when editing in Extended Tags

**URL:** https://community.mp3tag.de/t/unnecessary-files-are-modified-when-editing-in-extended-tags/44137
**Category:** Support
**Created:** [January 8, 2019, 3:07am UTC](https://community.mp3tag.de/t/unnecessary-files-are-modified-when-editing-in-extended-tags/44137 "2019-01-08T03:07:27Z")
**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: [January 8, 2019, 6:03am UTC](https://community.mp3tag.de/t/unnecessary-files-are-modified-when-editing-in-extended-tags/44137/2 "2019-01-08T06:03:17Z")

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see e.g. here:

> [@File Modified Dates updated Unnecessarily](https://community.mp3tag.de/t/file-modified-dates-updated-unnecessarily/19340):
>
> I've noticed that if I have a group of files selected in the MP3Tag window and apply a change that only affects some, the Windows modified date/times for all the selected files are updated I had a few files that had an extended tag set wrong, and rather that search one at a time, I selected the whole folder and set the proper tag, expecting that only a few files would be modified Example: Copy a group of files to a temp folder (Comment field in all was blank) Apply MP3Tag to the folder a…

As nothing has been changed ever since, I suspect that this is a feature, not a bug.

The best way to minimize write operations is still to use a filter that pins down those files that should really be treated.

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