Ok, this is annoying.. Just started happening this morning and I can't figure this out. I can't open *any* .rtf file on an external drive connected to my Airport now... *from finder* I can SAVE a .rtf file on my external drive no problem, If I try to open it from finder... I get this message. If I open Textedit and browse to the file... opens fine. If I try to open the file with any other app *from Finder* I get the above message, from any app, I can open it just fine. This is just with .rtf files... I can still open any other file just fine. Eject/reconnect drive, still can't open. Restarted mac, still can't open. Restarted Airport, same. Drag the .rtf file to desktop, opens fine.