Support for the X1xxx series has been dropped some time ago. There aren't even drivers for Windows 7 for those cards so I'm surprised you got them working with Windows 8.1 without any issues.
yeah i really do have them working without any issues on Windows 8.
Ill try to upgrade for Windows 10 then and let everyone know, in case someone else wants to do it
So yes i managed to Setup the X1900 in Windows 10 as you can see at the pics. So i guess we can all other older cards try the same.
Just force manyally update the driver with the most recente driver available (mine was the Windows Vista from 2010).
It detected the grafic card and installed it without any issues...