Try it yourself with a `Blank App (Android)` under F#. The problem is that Xamaridea expects a file ending in `.csproj`, but F# projects end in `.fsproj`. The error is thrown [here](https://github.com/EgorBo/Xamaridea/blob/aa2762287f694ff566d3df845cb6d56b0e5ad6d1/Xamaridea.Core/ProjectsSynchronizer.cs#L107).