From Xojo Documentation
Class (inherits from IUnknown)
| This class is only available on the Windows platform.
For cross-platform development, use ＃If...＃Endif with the Target... specifiers to make sure you will not attempt to use this class on an incompatible platform.
IEnumVARIANT provides methods for enumerating a collection of OLE VARIANTS. Most collections can also be iterated through a common API for Item and Count, but not all collections support this.