Nothing. Nothng happens. I think I have found a glitch.

I tried again and navigated to where the program was by dragging the parent drawer icon into the file requester. Selected the program and OK. Works.
If I drag the program icon directly in the WBStartup window it works.
Can anyone add a program by dragging it into the file requester?
WBStartup 53.30 (18/02/2018)
asl.library 53.54 (16/04/2020)