Hope this helps someone else - I was having trouble getting hold of a driver for this modem that would work on win2k, but this works first time 0)
The following files are found inside the driver download file.
|mycat.cat||1 byte||14 Dec 1999|
|remvess.exe||36.9 KB||29 Jan 2001|
|es56tpi.sys||334.8 KB||22 Feb 2001|
|mdmess.inf||15.2 KB||26 Feb 2001|