Src File Extension
Src extension is associated with Source Code - source file. You have chance to open src files with Microsoft Visual Studio.
Src files stand for source codes. These source code files are created by Microsoft Visual Studio or similar kind of programming language.You have chance to create EXE application files by using Src files. Src files can be opened by Microsoft Visual Studio. If you need, you should check following web page for detailed information here.
What needed to Open Src file extensions.
Microsoft Visual Studio
Links about Src file extension