Hi. Is it possible to add Windows Explorer as an app? I tried it in Windows 8.1 x64, with no results. I'm only able of control it with the global actions.
What qualifiers are you using for the App definition? File Name, Title, etc. Can you post a screenshot of the app definition screen, that would be helpful.
I just made an Explorer app, leaving only the Owner Class Name field populated with a value of:
CabinetWClass
...and it works fine. I'm running Windows 8.1 64-bit.
The Find Window tool populates a bunch of fields with values for convenience, but almost always you don't want to leave all of the fields populated or you'll create an extremely specific definition that will only be recognized if all of the fields' criteria are met.