Description for .def file here has encountered a problem (BDE-Paradox app on XP)

I have an app with 2 users on W2K sharing paradox files on a third dedicated
W2K Workstation. Recently they have added another client using XP Pro and
since then if the XP Pro client launches after the 2 W2K clients he gets the
message : "Description for .def file here has encountered a problem and
needs to close.".

Does this ring a bell with anyone ?
TIA

Olivier