Greetings:
I recently purchased a iMAC after being tethered to the PC since 1982. I am pleasantly pleased with the exception of receiving picture files as attachments on emails. The only indication other than the context of the message speaking to a photograph attached is that there should be a picture is a square with a question mark in the center. Is this due to certain types of files not related to the Apple OS? If so, do I need to install some form of decoding software to allow these foreign files to be opened with the OS? Any remarks or advice would be most appreciated.

Ciao,
I recently purchased a iMAC after being tethered to the PC since 1982. I am pleasantly pleased with the exception of receiving picture files as attachments on emails. The only indication other than the context of the message speaking to a photograph attached is that there should be a picture is a square with a question mark in the center. Is this due to certain types of files not related to the Apple OS? If so, do I need to install some form of decoding software to allow these foreign files to be opened with the OS? Any remarks or advice would be most appreciated.
Ciao,