The Sony Ericsson 750 USB WMC OBEX Interface is a Windows driver used to enable communication between a Sony Ericsson mobile phone (such as the Sony Ericsson K750i) and a computer. The OBEX (Object Exchange) protocol is typically used for transferring files between devices, such as syncing contacts, transferring photos, or moving music between the phone and the PC. The WMC part of the name likely refers to Windows Media Center, which is a feature in certain versions of Windows for managing media content.