Windows only. Overrides the default application manifest, which can affect whether an executable application is themed.
If the value is a string it must name a file that is a legal application manifest containing the "dependency" element for Microsoft.VC80.CRT. If the value is the keyword :no-common-controls-6 a manifest without the element for common controls is used. If the value is nil, then the LispWorks manifest is used.
See Application Manifests for more information about Windows application manifests in LispWorks applications.
LispWorks Delivery User Guide - 10 Aug 2017