/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/ is in monodevelop-monogame 2.5.1+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/AboutAssets.txt
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/AboutContent.txt
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/AboutResources.txt
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Activity1.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/AndroidAssemblyInfo.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/AssemblyInfo.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Game1.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Icon-hd.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Icon-ld.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Icon-md.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/MacGame.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/MacInfo.plist
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/MacMain.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Program.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Resource.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Splash.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/Styles.xml
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSAssemblyInfo.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSDefault.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSGame.cs
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSGameThumbnail.png
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSInfo.plist
/usr/lib/monodevelop/AddIns/MonoDevelop.MonoGame/templates/MonoGameApplication/iOSMain.cs