Today is: Tuesday,22 May,2012 12:18:29 AM
FirstClass can actually interpret the file type between mac and PC files, however that will only work if the file was sent or uploaded using FirstClass and then received or downloaded using FirstClass.  It's still best practice to add the right 3 letter file extension on a macintosh file before sending it in email to a PC user.  (see the tip to the right)

File Extensions
You should add file extensions to mac filenames if your sending to a PC user, or if your not sure. Here are some common extensions you can use:
MS Word documents: .doc
Clarisworks/appleworks: .cwk
Excel Spreadsheet: .xls
Powerpoint: .ppt
Filemaker Pro 3: .fp3
 Last Modified: 17 March,2006
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