How to add button for SwiftSearch to Toolbar?

I wanted to add a button for SwiftSearch which is a superfast portable search application but no luck. The button I created and added to the toolbar just refused to open up SwiftSearch. My configuration is as follows:

<?xml version="1.0"?> SwiftSearch #rename4 "C:\Program Files (x86)\Misc Tools\SwiftSearch\SwiftSearch.exe" Search *{allfilepath|filem}

Where did I go wrong? Please help.

The button looks fine as far as Opus is concerned.

Whether that is the correct command line for running SwiftSearch.exe, I don't know.

Does running the same sort of thing from a command prompt work?

Does SwiftSearch.exe mind if the path to the file-listings file at the end does or doesn't have quotes around it?

(Does SwitftSearch.exe actually take a filepath pointing to a text-file that lists other filepaths? I can't find the SwiftSearch documentation online so couldn't check.)