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2.1.3.4.2.1 File Name

For the file name in a MIME representation of an attached file, MIME writers SHOULD use the value of the PidTagAttachLongFilename property ([MS-OXCMSG] section 2.2.2.10). If this value is not available, MIME writers SHOULD use the value of the PidTagAttachFilename property ([MS-OXCMSG] section 2.2.2.11). If the value of the PidTagAttachFilename property is also not available, MIME writers SHOULD use a default value or MAY use an empty string.<82> The attached file name SHOULD be written to several different MIME headers (2), as specified in section 2.1.3.4.2.2.

If a file extension is needed for mapping the attachment content type, it SHOULD be obtained by copying all characters after the last "." (U+002E) character in the file name.

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