Yes, you have to browse for the application via an admin share.
If you are an administrator, you can use the \\server\C$ share.
We need only the name of the application, and as stated in our manual, an application may call other applications while scanning, which implies that all these applications must be added to the 2X Console under Scanner.
Make sure that the application you are using supports TWAIN. Currently, we only supports TWAIN, and therefor, MSpaint will not work.
I would suggest you use the IrfanView application to test. Mind you, it is not the ideal application, but is good enough for a quick test.