Visual Basic 6.0 SP6: Run-Time Redistribution Pack
vbrun60sp6.exe is a self-extracting executable file that installs versions of the Microsoft Visual Basic run-time files required by all applications created with Visual Basic 6.0. The files include the fixes shipped with Visual Studio 6.0 Service Pack 6.
Needed for things like FwO Raven's PFF Ute, and the mission converter that comes with the C4 meds..