Blacklisting Applications

I had an email from a partner of ours who was looking to stop a user from changing the time on a Windows Mobile device.

I discovered that this can be achieved quite easily by modifying the following registry key.   HKLM\Software\Microsoft\Clock\AppState

If it’s 11 hex they can change the time – if it’s 10 hex the clock applet won’t run.


This then lead to a broader discussion of whether it is possible to prevent certain applications from being run.  My colleague Rabi Satter directed me to a great blog article he has written which describes how to setup a list of programs that are not allowed to run regardless of whether they have valid certificates or in ROM.

Comments (2)
  1. Ever wondered how you can stop someone from changing the time on a Windows Mobile device? No? Me either

  2. PianoSam says:


    very interesting, however, I don’t see any of these options on a mobile 6 device. Can we do the same on 6. When I tried nothing happened and after a reset one of my registry edits was removed.

    All the best,


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