Since Windows can't run the Mac application and will likely add a few completely unneeded files (thumbs.db, etc) to the directory (because all Mac .app files are folders that contain many files and folders), I would suggest compressing your Mac application into a .zip file first which will preserve the contents for when you deliver it to a suitable computer that can actually run the application.
To compress anything using the Finder's built in tools, right-click (or control-click) the item and select "Compress ". In a moment, you'll have a fresh .zip file you can transfer to your Windows file server or wherever you care.