To give you a helpful review or more details, could you clarify or what it is supposed to contain ?
The "GBS" in the filename could refer to a few different things depending on your field: GBS39.7z
: Sometimes used in emulation communities for ROM sets. To give you a helpful review or more
: A business-specific internal archive.
It seems is a specific file archive rather than a widely recognized piece of software. Because it isn't a mainstream application, there isn't a public "solid review" available for it in the traditional sense. GBS39.7z