New Post: Error code 0x80004002 when export message

when I try to export message from MFCMAPI, I choose Format in EML file (using PR_INTERNET_CONTENT), and then I got the error message says mapi_e_interface_not_supported == 0x80004002
Function IpMessage -> OpenProperty ...
File File.cpp
Line 639

I tried to use other format, works. but I just want to get full rfc822 format message.

Any ideas about this?
Thanks!