@Dima, this is how I make textures (also easier for noobs to install).
1. Convert to .dds
2. Edit in photoshop
3. Convert to .iwi
4. HXD first 2 lines replacement in the new one from the original, add 4 bytes cut the last 4 ones
5. CRC32fixer
6. Just put in the folder (no need to rename etc.)