http://deniska.dcemu.co.uk/bin/mapviiewer_beta.zip
Try this old beta version...
Here is how you figure out your checksum:
You mac consists of 6 hex pairs:
H1:H2:H3:H4:H5:H6
Convert each of them to decimal number, using window calculator (advanced mode)
For example, B2 ->178
So you have new set:
D1 : D2: ...D6
Your checksum for the config file will be
D1+D2-(D3*D4)-D5-D6
If the program exits right away - that means you miscalculated your checksum...