Hello all,
Do you know how to delete the private ID3 fields in mp3 ?
The private fields can be Windows Media Player things like :
WM/MediaClassPrimaryID
WM/MediaClassSecondaryID
WM/WMContentID
WM/UniqueFileIdentifier

There is also TXXX and UFID fields.
I don't know any MP3tag editor which can do that.

Have you already tried foobar2000's Utils > Rebuild MP3 Stream option?

- M.

I've just tried and that changes nothing The songs have the same size after.
But I've tried "Remove tags" in Foobar2000 and that removes the Windows-Media player id3 tags but also all the others id3 tags like title, artist, trck-number...

In that case you could try this:

• Make a copy of the files you want to adjust
• Use foobar2000's Tagging > Remove Tags from File(s) feature
• Load both the old (tagged) and new (untagged) files in foobar2000
• View the properties for your tagged files and select the desired fields (Ctrl + click on the field name, for multiple fields), then right click and choose "Copy"
• View the properties for your untagged files, then right click and choose "Paste Fields"

- M.

Thank you that's working.
But... Do you know how to do that for many files? Like a batch program ?
Because I want to delete the WMP tags in my MP3 because they are useless and I want to save some MB.

I'm not sure you'll save much space to make the effort worthwhile if saving MB is of real importance.

The method M described does work for multiple files. Just select more than one file and open the Properties dialog for them.
Note that it can be done quicker than that: copy all fields, remove tags, paste fields back, apply (no need for two instances of the Properties dialog).