you may replace guixt.exe and guixt.dll in the SAP GUI patch level. In the SAP
guide "NetWeaver SAPSetup" (also called "NW SAPSetup") there
is a chapter 'Adding New SAP Front-End Components to an existing Installation
Server' describing the procedure.
cite the relevant part; please see SAP documentation for more details:
installation server can be updated with new SAP Components using one of the
following two methods:
NWUpdateInstServer.exe from the SETUP directory of the CD / Source containing
the component to be added
Supply the path of the installation server and follow the wizard to update it
with components available on the source.
When using NWUpdateInstServer, the steps to be followed are quite similar to what
was seen between Steps 4 and 7 of Installation Server Creation.
NWSAPSetupAdmin.exe from the SETUP directory of the Installation Server that
needs to be updated with the new component.
Click on the toolbar button that states “Import Products”
Follow the wizard and supply the path to source where the Product to be inserted
into the Installation Server is available."