10 REM FILE TEST
20 OPEN 1, 8, 4, "TESTFILE,SEQ,W"
30 IF ST <> 0 THEN PRINT "FILE ERROR"
40 IF ST = 0 THEN PRINT "FILE EXISTS"
50 CLOSE 1

MISSING FILENAME

ERROR: #NT3SW0ID3ZY7P8Y8MB1FVJH6QP8FX5M5