HexCheats:

 Edit the file MAIN.EXE with the hex editor and

 Search for            5E FC 26 89 7F 39 26 83
 and change it to      -- -- 90 90 90 90 -- --

 and your health will not be reduced.

 Search for            5E FC 26 89 7F 3D EB 12
 and change it to      -- -- 90 90 90 90 -- --
 and search for        5E FC 26 01 47 3D 26 83
 and change it to      -- -- 90 90 90 90 -- --

 and your magic points will not be reduced.