Your plist file, once installed, can be found here:
/Library/Application Support/ProApps/MIO/RAD/Plugins/CanonE1.RADPlug/Contents/Resources
And it should read as follows: <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "https://www.apple.com/DTDs/PropertyList-1.0.dtd">