It is also only applicable when the Generation Method property is set to OnDemand.
See 3D Preview Box for more information.
Specifies whether to include the SOLIDWORKS file type extension (.e.g. -SLDASM or -SLDPRT) in the file name of the .drive3d file that will be created when using Autopilot Mode.
False will omit this from the file name, True will include it.
Property Type: Static
Default Value: False
Setting this property to True means that the .drive3d file will be created with the extension in the filename e.g. Cupboard.sldprt will be Cupboard-sldprt.drive3d. (This is legacy behaviour)
Setting this property to False means that the .drive3d will not include the file type extension in the filename e.g. Cupboard.sldprt will be Cupboard.drive3d.
Hierarchical Reference: ControlName.UseSWExtensionSuffix
Value set in Form Designer. Static properties can be made Dynamic by double clicking the gray radio button.