The dialog you are opening is asking you to pick an entire project/solution to open (not just the .aii file you are wanting to target). This is why you are not able to see individual script or WebUI test files (or their .resx files either).
The area you are looking for is the "Source Control Explorer". You can get to this area by:
- Open Visual Studio and the project you are working on
- Open the "Team Explorer" (tab next to Solution Explorer on the picture you provided, highlighted item in provided screenshot)
- Double-Click Source Control within your tfs folder to open the Source Control Explorer
the Telerik team