Windows 95 build 1163 is the Release Candidate 1 build of the USB Supplement to Windows 95 OSR2 (also released as Windows 95 OSR2.1).[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 now identifies itself as "4.00.950 B" in the system properties, just like OSR2 and the final release of OSR2.1. You have to update OSR2 with "usbsupp.exe"