MOVE-FILE MOVE MS
MOVE-FILE ( src-str src-strlen dst-str dst-strlen -- errno|0 )  
<PFE-MISC>
like RENAME-FILE, but also across-volumes
moves the file from src-name to dst-name and returns an error-code or null

reference: p4_move_file in ../src/misc.c:0963, export CO MOVE-FILE