build ContextMenuCustomHost

1. install nuget package: Microsoft.Windows.CppWinRT and Microsoft.Windows.ImplementationLibrary
2. clean project, select debug or release,repeat this step every time you modify the configuration
   (you can change the output to ContextMenuCustomApp debug or release bin folder)

build ContextMenuCustomApp

1. change PackageCertificateKey
2. build

build ContextMenuCustomPackage

1. change PackageCertificateKey
2. set this project as startup project
3. build and run

publish

1. clean all
2. select release,rebuild ContextMenuCustomHost project
3. publish on ContextMenuCustomPackage project

some helpful links

https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/desktop-to-uwp-extensions#context-menu

https://github.com/MicrosoftDocs/winrt-related/blob/docs/winrt-related-src/schemas/appxpackage/uapmanifestschema/element-desktop5-itemtype.md

https://github.com/microsoft/Windows-classic-samples/tree/master/Samples/Win7Samples/winui/shell/appshellintegration/ExplorerCommandVerb

https://github.com/microsoft/AppModelSamples/tree/0f88fe0a8bbb90051f6c126741b881288bb5cabb/Samples/SparsePackages/PhotoStoreContextMenu

https://github.com/microsoft/terminal/tree/fb597ed304ec6eef245405c9652e9b8a029b821f/src/cascadia/ShellExtension

https://github.com/MicrosoftDocs/windows-uwp/blob/docs/hub/apps/desktop/modernize/integrate-packaged-app-with-file-explorer.md

https://docs.microsoft.com/en-us/cpp/cppcx/wrl/windows-runtime-cpp-template-library-wrl?view=msvc-170