A Windows GUI program to exercise the ShellExecute/ShellExecuteEx APIs.
The UI lets you choose many of the parameters to the API calls, and then executes the API.
I've found this a surprisingly useful test program for exercising the ShellExecute(Ex) APIs. It lets you easily test how an application behaves with different verbs.
As you can see from the screenshot, there are 4 string UI fields that correspond to the 4 string parameters of the Windows ShellExecute API, and the fifth UI field allows you to choose one of the SW_* values.