Open .xlsm file in hex editor
Look for DPB= near end of file
Change DPB to DPx
Save file
Open file, click OK to any pop-up error msg box
Add your own password to VBA project.
I forgot to add a major step. Sorry, it's been a while since I had to remove a vba password.
Do this first:
Make a backup copy of the xlsm file, just in case
change the extension of the original xlsm file to "zip"
in the zip archive, find the file xl/vbaProject.bin
open vbaProject.bin in a hex editor
search for "DBP="
change to "DBx=" and proceed as above...