Executable file not recognised

I recently converted a .bat file to a .exe file using the first process described here (i.e. using IExpress):

https://adamtheautomator.com/bat-to-exe/

I have placed the resultant .exe file in its own folder inside the PortableApps folder, but the PA Platform fails to recognise/find this .exe file. Yes, I have refreshed the app icons and even restarted the computer and PA platform but no joy. If I navigate to the folder and double click on the .exe file it performs as expected.

Any thoughts on why this is?

PvP