Not all applications work the same. It's a general rule that when someone has a file opened, another person can't edit (or remove) it.
Even in Excel you can't remove a file that is locked by someone else. You can create a temporaty local copy of it and edit that, but that's not the same.
Thanks for the reply, but please read my post again. This is a read-only drive for all but me. Any Excel files for example which are opened by others are forced to read-only. While they have that file open, I am free to do whatever I want to the original. There are no ties to it. So why are Adobe PDF files the only odd balls?
Read-only only means they can't save any changes.
Excel probably creates a local copy of the file and allows the users on work
on that, while the real file remains unlocked.
Anyway, I'm not an Acrobat engineer so all of this is just guesswork.
If you want, you can ask Adobe to change this behavior here:
You might be correct about the Excel. Good point.