Normally, many files in VS2010 are opened in many tabs, while massive working on project. Many times I find myself right-clicking on tab-title and searching for "Show/Select/Scroll-to this file in solution explorer" and I can't find it.
Is there way to finding, automatically-by-demand, opened file in the solution explorer?
I don't know if you can do it on-demand, but you can enable the option "Track Active Item in Solution Explorer" (options->Projects and Solutions) which will always select the active tab item in the solution explorer.
This isn't exactly what you're looking for, but it would automatically select the "active" file in the Solution Explorer:
Tools-->Options-->Projects and Solutions-->Track Active Item in Solution Explorer.