My USB is locked but I forgot which lock software I used before

Hello,

All my valuable documents saved and locked in an USB in which I used a "lock a folder' software to lock the folder for security. However the software in my PC is gone and I am not able to find the software back (downloaded a few though but none is compatible), I forgot the exact name of the software as it was actually many years ago.

What I can do next? Please.

Million thanks!