Street Fighter: Duel images

[Hollow]

"Re-save the ASTC image part as *.ASTC file"

Pardon me, how exactly do I accomplish this?  Is there an option for this in the hex editor?

If you are using a hex editor and doing it manually,

1. use the DELETE key to remove "VEGATOPJOY000000" (the first 16 bytes of the file).
2. Now, the first 16 bytes of the file is the ASTC image header, you'll need to XOR with the key above.
3. Re-save the file by File -> Save as and change the file extension from .png to .astc.

To encode back, reverse the 3 steps above.
- Rufas

Hello?  Are you there?  Could you direct me to or recommend a hex editor that allows me to both XOR and re-save the file as an .astc file?  I can't go any further at the moment.