How to mod maps an areas??? Please help!!!

For mod maps and areas I need to launch TMH.exe like a normal monster or I need to use another tool??? and I have another problem... when I launch TMH.exe it proces all archives until pixels_012_RGB8888 and says "TMH.exe has stoped working"... I save the pixels_XXX_RGBXXXX.bmp archives in A8 R8 G8 B8 format (32bits) and pallete_XXX_XXXXX archves in A1 R5 G5 B5 format and I'm not sure about how to made it ...please help!!!