Export Visual Studio 2012 to 2010 sln format

My teacher is complaining that he can't read the VS2012 format on his VS2010 environment. I looked around in settings and so on but couldn't find anything. How can I give the project in an VS2010 readable format to my teacher?

How do you make a SLN file?

Go to your folder with your solution sln file, and just type msbuild. It will automatically start building the sln files. If you use nuget packages, you will get errors about missing packages. You may have read somewhere that you only need to type “msbuild /t:restore”, but I think that it's only works for .

How do I save a SLN file?

Just click on the solution in the Solution Explorer and then click on "Save myProject. sln as..." in the File Menu. This will save your . sln in the folder that you choose without breaking the references.

Modifying sln manually

Backup your project folder (copy/paste to another location, like a folder called "backups")
Open sln file on wordpad
Change the "header" of opened sln to below (the first lines that matches mentioned lines below, except by version number/name):
```
Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
```

I'll see if there is a way to do it in project options...