A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
Maybe adding a '.' after $(ItemDir) will also work:
$(ItemDir).
This will probably generate "D:\AppForms\SP1_Forms\SP1_Forms\.", which is equivalent to "D:\AppForms\SP1_Forms\SP1_Forms".