ACIS can store modeling information in external files, called
save files. These files have an open format so that external applications, even those not based on
ACIS, can have access to the
ACIS geometric model.
The basic information needed to understand the
ACIS file format (focusing on the reading, or
restore, operation), includes the structure of the save file format, how data is encapsulated, the types of data written, and subtypes and references.