Mail Marshal SMTP 6.7.2 and Zipx files

We have recently upgraded winzip to version 14 and are using the .zipx format instead of .zip.
I n MailMarshal SMTP 6.7.2 Outbound emails are now being blocked and treated as a deadletters.
I have some ideas around creating a custom file type to allow this out however I am wondering what others may have done to resolve this issue also?
Zipx format is not a default format type in mm 6.7.2.
StratfrordDCAsked:
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