WinXP Pro / Acrobat Pro 8.1.2: Acrobat Pro seems to munge the directory path to files it is trying to combine using the "Combine Files" option when the files to be combined are in a shared directory that is mounted as a lettered drive. For example, here is the path of the file Acrobat is trying to open (I used Process Monitor to discover this): F:\Dir1\Dir2\PSF\Docs\Dir1\Dir2\filename.pdf However, the underlined part (everything from \PSF to the name of the file) is not correct, the actual path to the file is only F:\Dir1\Dir2\filename.pdf Interestingly, "Docs" (the part Acrobat is inserting between PSF and Dir1 is the name of the shared folder) is the name of the Shared Folder, so it seems to be combining the lettered-drive path with the absolute path for some reason. If I navigate to the files to be combined through the "My Network" instead of the mounted drive letter, then it works fine. It also works fine with files on "real" networked shares that are mounted as letters. And, I can use the Acrobat "Open..." file command to open files in shared directories through the lettered path. The problem only occurs when trying to use the "Combine Files" option. This leads me to believe that Acrobat is doing some type of non-standard file access when it combines, and that method is not working with the parallels share folders.