I used to be able to do this as of last week - but I just tried to open up a powerpoint presentation that's saved on my Mac desktop, and I'm not seeing the file on my Parallels desktop. When I try to open the file from within Powerpoint, I get the following error message: "Sorry, we couldn't find '\\Mac\Home\Desktop\[file name].pptx'. Is it possible it was moved, renamed or deleted?" Can you please tell me how to fix this? Thanks.