Error 0x800401E6

Value: -2147221018 | 0x800401E6 | 2147746278

What does it mean ?

MK_E_INVALIDEXTENSION  
Bad extension for file
Value: 486 | 0x01E6 | 0b0000000111100110

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

Other Errors for FACILITY_ITF