These are the signed FireWire OHCI-driver dedicated to all FireWire cameras 
of  Jenoptik Optical Systems GmbH / buisness area Digital Camera.
There are two drivers:
firecamj221.sys for 32-Bit operating systems Windows XP/Vista/7
fircamj221_x64.sys for 64-Bit operating system Windows XP/Vista/7 64 Bit
The selection of suitable driver happens at installation time depending of the
running operating system.
Don't move these files from the installation place 
[ProgramFilesFolder]\Jenoptik\ProgRes\Drivers\FireCamJ221.
The installer copies the INF-File as OEM*.inf into Windows\inf 
and then ends successful.
The first suitable FireWire camera completes the process if plugged in. 
No user action is necessary for the first and all  other suitable cameras.