you don't have to change that much,
in case of the labels for example i meant
to edit the name of the texture in the .GR2
file so that you can add a new texture with
that name in the tex folder.
Quote:
I have try to editing a .GR2 ,but that give a checksum error 
and i have no idea how to recalculate 
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don't add/substract anything,
all you would have to do is search for the
texture name string you want to change,
like CR9C_2.DDS and rename to CR9C_3.DDS,
while keeping the size of the string.