Q. I sometimes receive e-mail messages with a “winmail.dat” file attached that I cannot open. Why does this happen, and what can I do to fix it? A. The winmail.dat file usually appears because various ...

Spotlight: Choking on Finder.DAT files? We've received scattered reports from readers indicating that Mac OS X 10.4.x's Spotlight may have problems indexing and searching for Finder.DAT files -- data ...

I've been writing about software and hardware for PCMag for more than 40 years, focusing on operating systems, office suites, and communication and utility apps. I've specialized in everything related ...

We’ve all seen mysterious .dat file attachments in our inboxes from time to time. In most cases the .dat attachment originates in Microsoft Outlook, which produces outgoing messages using a slightly ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...