Create projects under additional VS versions

[CharliePoole]

I was thinking VS2012 and VS2013. @OsirisTerje What do you think?

[OsirisTerje]

Do we need separate projects for these versions? They use the same project format. But, in VS2017 we can can use either the new or the old project format, and the new one is different from the old, so perhaps we should add that? But then, it would use the same C# files, only they should stay in the same folder structure.
As it is now, the files are linked in, and that doesn't really go well with the standard in the new format, although it works with the links, it is not standard.

[CharliePoole]

Is project format the only thing that can go wrong between versions? I'm thinking, for example, of errors that get introduced if the adapter references something that isn't in the older versions of vs.

We may not need more than one project, but if we say we work under VSxxxx, then doesn't it seem we need to test that?