Windows 95 build 1156 is a Beta 3 build of the USB Supplement to Windows 95 OSR2 (also released as Windows 95 OSR2.1). It is only available as an update to OSR2 in the form of USBSUPP.EXE, and it is unknown if a full build was ever made. This build still identifies itself as "4.00.950 c" in System Properties, just like earlier OSR2.1 builds, although those used an upper-case C instead. You have to update OSR2 with "usbsupp.exe"