Information about the .gbm (gbm) file type

Below is all the information we have available on file about the .gbm (gbm) file type.

.gbm
MapServer bitmap store file. Contains bitmaps associated with the sheet file (.gsf) of the same name.

The following link provides further information related to the .gbm file extension:

Where this is available we would like to include file format information on .gbm files, as well as information on how to view or open files of type .gbm. If you know of any information which we have missed then please let us know.