set r to moveFile(POSIX file "/Volumes/share/test1.txt", POSIX file "/Volumes/share", "test2.txt")

to moveFile(oldFile, newFolder, newName)
	tell application "Finder"
		set f to item oldFile
		set p to parent of f
		tell f
			set its name to newName
		end tell
		move file newName of p to newFolder
	end tell
	return ((POSIX path of newFolder) as text) & "/" & newName
end moveFile