I think the name "app" is quite universally recognized as "mobile application", i.e. application for iOS or Android.
I think you should call it "application" to avoid confusion. Windows application would be even clearer.
I think you should call it "application" to avoid confusion. Windows application would be even clearer.
There is not a desktop/mobile distinction in terminology other than the one you're attempting to enforce.
I still don't think most people would call Excel or Photoshop "apps", but I'm absorbing the points of view expressed in the replies to my comment.