I have installation of VS 2010 SP1 with T4 editing and modelig tools installed problem is that suddenly all icons fro .tt files gone and it has unknown icon. when I open it in VS simple text editor is opened not tengable nothing is working reinstalling extention did not fix the problem. I have notification when I open vs that there are extension updates available and it says that modeling and editing tools update is available. but when I click download button nothing happens. Pleas someone recommend something my projects heavily depend on .tt.
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I found that there was a problem with Visual Studio installation so After clean reinstall everything works perfect