Hi,

I don't know. This is becoming a more popular discussion so worth some investigation.

There are plans to allow sub folders below the sketch for libs or ano code + a shared code folder of users choosing. It might be that having these items in sub folders is easier for tfs.

I also don't know what happens if you use the visual micro "project>show arduino core and library code". This option adds the libs and core sources as short cuts into the project. Maybe that helps tfs?

Thanks

I see. Arduino libraries can be located in one of a few known locations. At compile time the #includes from the sketch .ino files are parsed and matched to a folder/lib within the known locations. 

The location that is used for "user" libraries is usually "mydocuments/arduino/libraries".

"mydocuments/arduino" is known as the sketchbook folder and can be overridden in the Ide locations config dialog. Of course overriding the sketch book means that the location of the user libraries folder will also be overridden.

Hopefully during the next few weeks we will expand to allowing the VS project structure to be used to "tag" in linked or direct files as you would any normal MS project.