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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

PidTagAttachFlags Canonical Property

This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.

Contains a bitmask of flags for an attachment.

Associated properties:




Data type:



Message attachment

This property is used for MHTML support.

One or more of the following flags can be set for the PR_ATTACH_FLAGS bitmask:


Indicates that this attachment is not available to HTML rendering applications and should be ignored in Multipurpose Internet Mail Extensions (MIME) processing.


Indicates that this attachment is not available to applications rendering in Rich Text Format (RTF) and should be ignored by MAPI.

If the PR_ATTACH_FLAGS property is zero or absent, the attachment is to be processed by all applications.

Protocol Specifications


Handles message and attachment objects.

Header Files


Provides data type definitions.


Contains definitions of properties listed as alternate names.

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