The PR_ATTACH_EXTENSION property contains a filename extension that indicates the document type of an attachment.
| Header file: | MAPITAGS.H |
| May be exposed by: | Attachment subobjects |
| Identifier: | 0x3703 |
| Property type: | PT_TSTRING |
| Property tag: | 0x3703001E (0x3703001F for Unicode) |
The PR_ATTACH_EXTENSION property is set by the client application at submission time.
The messaging system uses PR_ATTACH_EXTENSION when converting message attachments (in-route conversion) or launching applications based on attachments in received messages. If the sending client does not provide a value for this property, the message store handling the attachment is not obligated to generate it. The receiving client should first check for PR_ATTACH_EXTENSION, and if it is not provided, should parse the filename extension from the attachment's PR_ATTACH_FILENAME or PR_ATTACH_LONG_FILENAME property.