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mpsigstub.exe cabinet file

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At least once a day I receive a ZoneAlarm warning that reads:
Self-Extracting Cabinet is trying to launch
I deny letting this file open. Later the warning message appears again but with a different string of numbers. The file name is the same. What is this file mpsigstub.exe? If it is safe, how can I allow it next time if the number string changes daily? ZoneAlarm will see this as a new file and repeat the warning, which must be acknowledged. (I read somewhere that this might be signatures for Windows Defender.)
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Hello jimhaynes and welcome to the G2G HijackThis forum. Go ahead and allow it. It is indeed part of a Microsoft update for Windows Defender.


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