Technologies for developing a client-server information system on Windows XP?

Question

Database

Tell me the technology stack for developing a client-server medical information system with the obligatory ability to run the client on Windows XP. The customer is fundamentally against the web solution.
Additional requirements:
1. Database of 20-40 tables
2. A lot of work with large texts
3. A system for generating and printing reports
4. From 20 to 50 clients
5. A modern operating system for the server.

Answer 1

with the mandatory ability to run the client on Windows XP

IMHO, the only requirement that limits the choice, tk. everything else is trivial.
.NET FW 4.0 is installed on XP, so take C# + WPF and develop. It is possible and WinForms in principle, if this application is a la file cabinet.
Because on the server - a modern OS, then the stack on the server can choose which one you like (this is if the client needs a thin one).
Libraries under will be enough. If the task is completely non-standard, XML and XSL-FO will help you out.