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I have a file that was sent to me with a .xmdx extension. Is there any way to convert it to something readable or open it with a third party application? I have never seen a file like this before so I don't even know where to begin.

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I've checked a number of file type extension databases and have come up with nothing; not even close spellings. without more info on the source of the file or its content, can't say much more. – Frank Thomas Dec 10 '12 at 20:09
What are the first dozen bytes of these xmdx files? – Hennes Dec 10 '12 at 20:51
up vote 2 down vote accepted

xmdx files are the encrypted back-up answer files produced by the examination-taking software called SofTest, often used in law schools for essay examinations. I know of no way to open them that does not involve using SofTest as an examination-administrator.

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