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PidTagAttachExtension Canonical Property

Contains a file name extension that indicates the document type of an attachment.

Associated properties:

PR_ATTACH_EXTENSION, PR_ATTACH_EXTENSION_A, PR_ATTACH_EXTENSION_W

Identifier:

0x3703

Data type:

PT_STRING8, PT_UNICODE

Area:

Message attachment

These properties are 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 these properties, 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 file name extension from the attachment's PR_ATTACH_FILENAME (PidTagAttachFilename) or PR_ATTACH_LONG_FILENAME (PidTagAttachLongFilename) property.

Protocol Specifications

[MS-OXCMSG]

Handles message and attachment objects.

Header Files

Mapidefs.h

Provides data type definitions.

Mapitags.h

Contains definitions of properties listed as alternate names.

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