that was my first idea to rename a waypoint file because it seems fitting with some other maps.
renaming a .pwf file was useless, the game didn't recognize it.. but you can rename the map just to be sure if it's really compatible or not.
on-topic. I don't think that's possible to edit a waypoint file to work for another map, and even if possible you should encounter some problems with it. so the best way is to make your own personalized waypoints that should be nice for your CSDM, GG, ZP (or whatever) server
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I made a tutorial of how to make waypoints, feel free to read it:
making waypoints for podbot mm ( tutorial ) 
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