Try this one ....
You must be registered to see links
You did not changed file name protection.
If you see G1 weapon instead your design its means that GB file is missing (in your case file is there but not correct name in "file name protection").
File that you uploaded was just renamed in file explorer, that is not enough.
Use this Swordcrypt:
You must be registered to see links
Tutorial for Swordcrypt:
1st: Put your files in DECODE folder and start Decode.bat
2nd: Open EDIT folder and hexedit file to new file name and save it.
3rd: Start Encode.bat
4th: Open ENCODED folder and there you will find your file that have changed "file name protection"
This is just for file name protection.
After this you still need to hexedit like UlyssesUlric is showing you in "STEP 3".
Just another question, I have made some custom weapon bmp files. They do not show up in the inventory its just blank. I tried renaming some current files and that works. Is there anything special that needs to be done with bmp files also to show in inventory?
If you are asking about item icons in game not showing up, can be:
1st: That in inititem.dat "(Image "*******")" in config.pk and icon BMP file name don't match.
2nd: Your BMP icon size is not 32X32 pixel
Be sure you choose the right export variant while using GIMP. There is the option 'advanced options' where you can choose those variants. (this is also important if you want some parts to be transparent ^^)The BMP file was setup right however after exporting the encoder failed. Just needed to repoen the file in paint to recode it and they came out fine.