Thank you for your answer, but this is not the point where I have the problem.
I can add textured to the map editor to use them afterwards (then, I have both set of textures), this is not a problem.
The problem comes here:
Normal map = N
Restored version= R:
N has a texture with a name text1.bmp=T1
R has a the same name for other texture.
I add the texture "text1_new.bmp=T2" to the software (I can use the texture). Then I have T1 and T2 in different files. Until this point, every thing ok.
I would like to open R with a certain software and to replace T1 for T2 in all the required places. I did try with browedit 586 but did not work (always have to replace cell by cell), or at least I did not find the correct option. By the way I'm scripter, I can program, but graphic stuff is not something I am skillfull.
I could do it replacing one by one in the entair map (time consuming, and boring to me), but guess should exist other method, or at least an option I do not know.