Other, than tags, textual data in music files?

[ohrenkino]

see here on how to remove PRIV fields:

Remove WMP PRIV Tags

I have many files that WMP tagged with it's PRIV tags. I have tried several ways to remove these tags with no luck. I created an Action Group, Chose Remove fields as the action and entered this for the fields to remove: WM/MediaClassPrimaryID;WM/MediaClassSecondaryID;WM/WMContentID;WM/UniqueFileIdentifier;WM/WMCollectionID;WM/WMCollectionGroupID;WM/Provider The tags are not removed when I run the group. So, how can I remove these tags? Thanks for any tips.