Visual studio solutions file is part of VS project which describes its configurations, relations in the project. It has XML file format. Solution file is MS Build script file which makes it manually alterable by the programmer and allows him to add custom codes in the existing script. Solution file is entirely different from project file in terms of working.
VS project file only contains project specific information, ignorant of its solution. Whereas, Visual studio solution file knows all about the project that is associated with that solution and references of them.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .SLN file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .SLN file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .SLN file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.
There may be several reasons why you cannot open the file with .SLN extension. Directly on this website you can find a solution of the most common problem with the .SLN file – that you do not have on your computer the appropriate program to open the file.