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When I open a PDF in Windows 8 it is opened in TWINUI, which I presume is a Windows 8 App. When I Alt-Tab away from it I can not Alt-Tab back to it, it is gone from the list of applications shown when holding down Alt and pressing Tab.

Since I have not found anyone else with this problem when searching for it, I guess I have made some change to my system, but I can not recall what, in that case.

How can I make Apps (TWINUI in particular) appear in the list of windows when Alt-Tabbing?

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