Error 0xC00D004C

Value: -1072889780 | 0xC00D004C | 3222077516

What does it mean ?

NS_E_WALKER_UNKNOWN  
Unknown file type.
Value: 76 | 0x004C | 0b0000000001001100

Where does it come from ?

FACILITY_MEDIASERVER  
Windows Media Server
Value: 13 | 0x00D | 0b00001101

Other Errors for FACILITY_MEDIASERVER