Despite the fact that MonoDevelop on Windows and OSX you cannot create .app on Windows - Windows does not have any of the necessary libraries (to compile your application on OSX you need to install Xcode for MonoDevelop)
You can compile any non-user interface DLL on Windows and then link them to an application on OSX, but there is probably no use for this if you don't need to run unit tests from Windows or something like that . The Mono project is focused on porting .NET development to OSX, and not vice versa.
Kendall trego
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