I set a "password-to-open" security requirement for a file that I created years ago, and I've always been prompted for the password to open it. I just recently noticed that I could open it WITHOUT a password. Rebooted to make sure it wasn't some weird memory thing, and sure enough, the password requirement seems to have been completely removed.

I actually save a backup of the file a few times / week, and noticed that the Dec 20th backup DOES still have the password requirement, but the Dec 24th backup does NOT.

So somewhere in those 4 days, the password requirement got stripped away. But to the best of my knowledge, that can only be done via the small Tools... dropdown in the Save As window, which I 100% have not used.

Has anyone encountered something like this before? I'm concerned, although virus scans on my machine come up clean...