Type the following from the DOS prompt:
ren apb.exe cheat.txt
debug cheat.txt
Then for infinite lives, type:
e 14fe 90 90 90 90
For stop timer, type:
e 725 90 90 90 90 90
For infinite health, type:
e 72a 90 90 90 90 90
Then type:
w
q
ren cheat.txt apb.exe