I'm using TrueStudio, but this should relate to any of the IDEs that are Eclipse based.
There are two types of searches available. The Search menu on the main drop down menu, and the context menu that pops up when you right click on a word in a source file. In the drop down menu you can limit searches to source code files using *.c, *.h in the search window. When you use the right click and select "Search Text > Project" you have no such option.
I could swear that when I first started using this IDE and did a search from a right click, that it only searched source code files. But now it is searching them plus .map files, .list files, and sometimes .su files.
Is there any way to change that behavior and limit it to just source code files?