Eclipse Can't Find Files that exists

Question

I push Ctrl + Shift + R to find files in Eclipse, the dialog open but not find any file.

You can see the problem in this file:

The file is not derived.

Answer 1

As seen in your screenshot you've some working sets selected in the Open Resource dialog. The project from where you're trying to find resource is probably not in the selected sets.

Click on the down pointing arrow in the dialog and select appropriate working set.