Hello,
ASW is just like a project file. To use it in deskscape you will need to export the project to deskcape file format. Refer screenshot below. Click "Export animation...." button, you will need to fill up some information. Some needed some not. Once that is done. It will create a file under your given name. It will then appear under Deskcapes Installed item listing.

Thanks
Basj,
Stardock Community Assistant.