EXOSAT image files (.IMG) are produced by command write/exo filename. These binary files are operating system dependent (so dont ftp them!).
A FITS image file (.FITS) is produced by the command write/fits filename. These files are operating system independent.
A file containing spectral information written in XSPEC ASCII format are produced by the extract command. They have the extension .log and can be made into XSPEC sf pha files using the mkpha program.
File containing timing information written by the extract command in a QDP format that can be accepted by XRONOS. They have the extension .qdp
Photon events files containing a list of photons as a binary table in FITS format. These conform to the Rev0 ROSAT format.