Error 0x8004120D

Value: -2147216883 | 0x8004120D | 2147750413

What does it mean ?

PRTH_E_MIME_EXCLUDED  
The URL was excluded because its content type (multipart/x-mixed-replace) is not supported.
Value: 4621 | 0x120D | 0b0001001000001101

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

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