HRESULT_FROM_WIN32

#define HRESULT_FROM_WIN32(x) (x ? ((HRESULT) (((x) & 0x0000FFFF) | (FACILITY_WIN32 << 16) | 0x80000000)) : 0 )

Maps a WIN32 error value into an HRESULT. Note that this assumes WIN32 errors fall in the range of -32k to 32k.

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