This was a Beta NT4 driver no longer supported by Opcode (which was purchased by Gibson). They don't currently support Win Nt 4 or 5, but anything is possible if there is enough demonstrated interest.
This driver will not work with Windows 2000. I think it might be made to, with a little work. It appears to install, but doesn't properly update the Registry.
The following files are found inside the driver download file.
|64X-7-02.ZIP||22.0 KB||3 Jul 1998|
|64X-7-02.ZIP/64x.dll||23.6 KB||2 Jul 1998|
|64X-7-02.ZIP/64x.sys||27.9 KB||2 Jul 1998|
|64X-7-02.ZIP/OEMSETUP.INF||179 bytes||19 May 1998|
|64XNTPB1.ZIP||651.1 KB||11 Jul 1998|
|64XNTPB1.ZIP/DATA.TAG||119 bytes||10 Jul 1998|
|64XNTPB1.ZIP/SETUP.EXE||59.4 KB||24 Mar 1997|
|64XNTPB1.ZIP/SETUP.INI||58 bytes||10 Jul 1998|
|64XNTPB1.ZIP/_INST32I.EX_||325.9 KB||4 Apr 1997|
|64XNTPB1.ZIP/_ISDEL.EXE||8.2 KB||24 Mar 1997|
|64XNTPB1.ZIP/_setup.dll||11.3 KB||24 Mar 1997|
|64XNTPB1.ZIP/_sys1.cab||190.0 KB||10 Jul 1998|
|64XNTPB1.ZIP/_user1.cab||7.6 KB||10 Jul 1998|
|64XNTPB1.ZIP/data1.cab||86.9 KB||10 Jul 1998|
|64XNTPB1.ZIP/lang.dat||352 bytes||13 Mar 1997|
|64XNTPB1.ZIP/layout.bin||334 bytes||10 Jul 1998|
|64XNTPB1.ZIP/os.dat||419 bytes||19 Mar 1997|
|64XNTPB1.ZIP/setup.ins||56.0 KB||10 Jul 1998|
|64XNTPB1.ZIP/setup.lid||47 bytes||10 Jul 1998|
|64xbeta_readme.txt||8.0 KB||13 Sep 2000|
|Readme.txt||4.4 KB||14 Jul 1998|