Windows support

[csarn]

On windows, the "snippet" executable cannot be run due to missing ".exe" extension. If the executable is called "snippet.exe", it works.

Maybe the extension can be added independent of actual platform, as it does not hurt on non-windows operating systems.

[grafov]

It is reasonable suggestion, I will think about realization. I would like to accept PR too that will add such multiplatform support for snippet names.