I'm not sure about the workings of the individual 'back-slashes' etc, however, if you Google even just this part...
RUNASINVOKER && start \"\" \"%1\"\""
then you will find countless links to "Forcing a program to run, without Admin privileges"...
One of the responses from a Developer, is this...
"This is right, i use it at work for users who don’t have admin rights but want to update the application and we don’t want them calling us all the time just for that.
Also it doesn’t work for every application. If it’s an app the downloads and install an msi no chance, but an exe that extracts and installs then works fine. "