The Russian Misson Control Center uses Firebird.
I quote the Firebird Development list
FYI – our colleagues from the Mission Control Center tested format of
VMT in the following environment
Intel(R) Itanium(R) Processor 9310
HP C/aC++ Version A.06.26
and it differs from what we have on windows/linux. I do not have access
to that box myself, so I can’t report what is actually that format. But
an attempt to access it as we do on windows/linux cause an error.