Checked my own drives for "metadata" and 90-95% of mine were related
to cryptographic and/or profile management. It doesn't appear to a wise
course of action to delete these type of files without knowing exactly
what/why one is doing so.
Although I have Office 2003, I have never used PowerPoint. If you use
PowerPoint, it appears that it generates a lot of metadata files. See:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;314797
Can you safely delete them? Totally up to you. Doubt you'll ever find
a comprehsive "Metadata-files-that-can-be-safely deleted" list. If such
files aren't consuming a substantial part of your hard drive--and if all
is running well--why tempt the PC Gods to save a few thousands of
bytes, or even to save a few megabytes?
As you can tell, I'm from the old "If it ain't broke, don't fix it" school.
Search Google for "what are XP metadata files" and for
"what is metadata?" You'll get a lot of hits. Metadata is data of data.
Makes sense, right?
Good luck.