Make sure you have a backup of the file in case something goes wrong.
Use a hex editor to find and replace "DPB" with "DPx"
If you're trying to unlock a .xls
These are older files but they are still around. Open file, open the file in your hex-editor and find for text string "DPB":
- open and open "xl" folder
- extract "vbaProject.bin"
- do hexedit method (see left)above on the "vbaProject.bin" file
- save and reinsert into zip
- rename back to xlsm.
- repeat steps previously outlined by changing and then removing the password.