Originally posted by Lobo Lunar
Well, maybe this is not your awnser, but the GetFullPathName is the same as msdn's.
This link resolves it: msdn states the FILE must exist (a folder is a file). So it fails if the file does not exist, which is exactly what happened. So my conclusion is that the helpitem is not entirely true, or just confusing. It tries to say the same, but it isn't. The helpfile makes you believe you can get the fullpathname of a theoretically existing file if the destination folder exists (which is true for the updatedll macro), but this is obviousely not true.
Maybe it won't be a bad idea at all to include links to the MSDN pages in the helpdocs if those functions are used (on the other side, who wants to write docs at all... If i suggest this, i probably would get 50 invitations to help write the docs