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Kristin,
thanks for the info.
Given that info and that you already have run LSRefresh on your copy
of MS Office, I think it's possible that the file in question is not
associated with PowerPoint and thus Remote Buddy can't retrieve any
application capable of opening that file from Launch Services (LS).
Things you may want to check:
1) Does the file have a .ppt extension / the filename end in .ppt?
2) Select the file in the Finder, then press Apple + I. Which
application is listed there at "Open with"? If none is listed, you can
select PowerPoint there and also click on "change all" to make sure
PowerPoint is associated with that filetype.
Hope that helps.
Best regards,
Felix Schwarz