Open QMSB File
The QMSB file extension is a proprietary format that is primarily associated with Questionmark Secure.
About Questionmark Secure
Questionmark Secure is a lockdown-enabled browser designed to provide a secure environment in which to take high-stakes assessments, such as quizzes and exams.
Once it's running, the only way you can access other programs is to exit Questionmark Secure or shut down or restart your computer.
The QMSB file stores encrypted security data, which is used by this program.
QMSB files should not be attempted to be opened manually, due to their nature.