I have a problem with accessing some PDF files from a folder. Some of them can be copies, deleted, whatever, but other PDF files from the same folder cannot be opened or anything like that.When I right-click on them, a few PDFs show me only Adobe Acrobat 9, Open, Open with..., Send To. If I try and open it with notepad, it says "Access Denied". The permissions are okay and the folder is not shared or anything like that. I tried to use Unlock tool, but nothing. Any ideas? Thanks!