I just looked at the TW_IDENT ITY structure of several version of twain.h including the TWAIN Developers Toolkit, and all versions are correct and the same:
TW_UINT32 SupportedGroups;
Where is the version of twain.h that has SupportedGroups as TW_UINT16?
(*) The form editor does not like the word i d e n t i t
Very strange 🙁 ?