This moves files between folders on the same volume (it can't be used to copy files between volumes). "filename" is a full pathname, and "newFolder" specifies the destination folder.
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example:
put MoveFile("HD:Telecom:session","HD:Stuff:") into err
This produces a file called "HD:Stuff:session". Note the final colon in the second
argument. Values returned have the same meaning as in the RenameFile XFCN.