
great post julie....heres a few file extensions you could use...
ELF - executable and linking format - now appears as the default binary format on operating systems such as Linux,
Solaris 2.x, and SVR4
EXP - export file - Some programs will use the .EXP file extension to denote an export from that program
INI - initialization file, or INI file, is a configuration file that contains configuration data (i.e. idiom terms)
RAW - raw image file contains minimally processed data from the image sensor of a digital camera or image scanner
SFO
PBP - .PBP files are used by the Sony PSP console to launch software such as a firmware update
PMF - Process Management Files - define the metrics that an application could collect during runtime