Extension Description Author File / Link
fax CCITT Draft Reccomendations for Group 3 Faxcimile Apparatus Link
mbox Concatenated e-mail messages in one text file, each introduced by a From line IETF (RFC 4155) Link
pager Telocator Alphanumeric Protocol v1.8 - Alphanumeric pager format (Acrobat) PCIA Download
pst Microsoft Outlook personal folders file for mail, calendar, and contact data (see also .ost) Microsoft Link
sfff ETSI ETS 300 838 Fax format Link
ITU T.200 Fax file format Link
CAPI 2.0 Fax file format Link