CorelDRAW X5 :: Saving Files - File Name Is Invalid In Certain Folders

I'm Testing77. I'm a graphic designer for screen printing, formerly a screen printer, and I work primarily in CorelDrawx5. I work on a MacbookPro, where I run Parallels and then XP in order to operate the windows-only program on my MBP. 

I'm posting to publicize an error I've been running into as far as saving cdr files goes. Again, I run x5 through parallels, and there a grey area between what characters you can use in file names on Mac as opposed to Windows. I can use a "/" on a mac file name, and not on windows for example. In any event, I get a 'save drawing' error saying the file name is invalid in certain folders. I have a 'corel files' folder that contains primarily registration mark template files, a folder for my companies files, 10-15 folders for my most-frequent clients, and a "Misc" folder that contains subfolders for less-frequent clients. I tend to get the error message in the subfolders of the Misc folder. The message does pop up in other folders.

Technical side: Instead of simply saving to c:/documents and settings/~username/my documents/corel files/~my clients files/FILENAME.cdr I have to go through a "Z:/" drive (what windows thinks the mac is) so the directory I actually save to looks like this: \psfHomeDocumentscorel files/~my clients files/FILENAME.cdr. Effectively directly linking the "Documents" folder in Mac to the My Documents folder on windows.