Symantec/Protection Engine (SPE) is unable to scan .mht files created by the Microsoft Windows Problem Steps Recorder application.
SPE produces an unscannable error.
This is not an issue with Symantec Protection Engine as the .mht files produced by Windows Problem Step Recorder are malformed.
The issue with these files is that they do not contain a null line after the "boundary=" definition. Because of this the preamble section of the file is interpreted as part of the message header which causes the file to be malformed.
The current workaround is to disable malformed container detection in SPE.
To disable malformed container detection perform the following steps: