You can test your copy of the distribution diskette, to make sure the copy is accurate, by entering the command CHECK *.* and the output should look like this: CRCK ver 4.2B (MS DOS VERSION ) CTL-S pauses, CTL-C aborts --> FILE: QUEST .COM CRC = 5A B2 --> FILE: QUEST .000 CRC = 65 2F --> FILE: MONSTER .DEF CRC = B1 B7 --> FILE: PLAYER .DEF CRC = 58 58 --> FILE: LEVEL1 .DEF CRC = 3A 53 --> FILE: LEVEL2 .DEF CRC = 4D 03 --> FILE: LEVEL3 .DEF CRC = 16 17 --> FILE: LEVEL4 .DEF CRC = D0 92 --> FILE: LEVEL5 .DEF CRC = BC 3E --> FILE: SCROLL .USE CRC = 7E D6 --> FILE: SCROLL .OLD CRC = 28 28 --> FILE: SCROLL .HNT CRC = 06 E6 --> FILE: READ .ME CRC = 55 5D --> FILE: SUPPORT . CRC = 36 C5 --> FILE: CHECK .COM CRC = BD 22 --> FILE: CHECK .TXT CRC = unknown ---------------------> SUM OF CRCS = unknown DONE The reason why the check.txt file is unknown is because the above information is added to it. Therefore, the sum will also be unknown.