Let's see...
I have version 5, if that matters.
1. Go to the player.
2. Right-hand side, there is a button on the player called "select source". Click, (or CTRL+O).
3. Select "Open Media Files"
4. Menu called "Edit Playlist" comes up.
5. Bottom left, tab says "File Types" next to one called "Browser".
There they are.
Another idea, in Add/Remove Programs from Windows XP, Home ed. you can select WMP to be the default player or Current Player to be so...but I do not think that was what you were asking for.
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