On an APP-V Client crate a shortcut to the Desktop of the Existing APP-V Application you would like to debug.
Open the Properties of the Shortcut change the TARGET as marked and include
/EXE cmd.exe
Between
sftray.exe"
and
/launch.exe
Existing Target:
"C:\Program Files\Microsoft Application Virtualization Client\sfttray.exe" /launch "LeechFTP 1.3.1.202"
New Target for Command line Box (Changes red)
"C:\Program Files\Microsoft Application Virtualization Client\sfttray.exe" /exe cmd.exe /launch "LeechFTP 1.3.1.202"
If you open that Link now you are inside the Bubble and are able to check code, Path or Registry Keys.