OSR2

OEM Service Release 2. Also known as Win95B, a version of Windows 95 released to PC vendors in late 1996 that included bug fixes, as well as support for enhanced power management, FAT32, IDE bus mastering, 32-bit CardBus, and DMI Version 1.1.

To determine the Windows 95 version, right-click My Computer, click Properties, and click the General tab. The first version of Windows 95 was 4.00.950. The second release known as OEM Service Release 2 (OSR2) or Win95B, is identified as 4.00.950 B.