Do you want to edit a file that encrypted(!) with XOR?
I do (At [SamyGO.tv Project]. Thanks to SAMSUNG's engineers for use this dummy encryption technique...)
So wxHexEditor has a unique feature that, you can edit the files directly even if they encrypted with XOR.
You can enable XOR ViewThru option from Tools -> XORView Thru
Here is the example test file, which has "testfile" strings repeatedly and some corrupted sections. After enabling XORView Thru with "testfile" ASCII key, you can see the change:
I also want to implement AESView Thru goggles for wxHexEditor that can read and write AES encrypted files on the fly, but this feature need some research. Not surprised if you see this feature later.