I know this has been discussed before but I did a search for "._DS_Store" and found nothing. Anyways, I had some files (PDFs) on my Mac and then copied them over to a Windows PC via my network. I was going (and did) copy the files from the PC to their destination. Then I get this notice saying that there are 9 hidden files. I went to Tools> Folder Options > View > and chose to show hidden files. Anyways, there are 9 hidden files: 2 of the "._DS_Store" files and 7 other files that correspond to the original file names, only they have a "._" before the file name. I've seen this stuff before, but forgot the purpose of these files. Any info about these files would be great!