Cross-Platform Database Access

[Coy Krill]

I've got a check program that we use to write our AP and payroll checks
while our company is in bankruptcy that started as a quick "I can do
that" project and is now growing to need a database (currently just uses
a shelve for the check register and a pickle for configuration data). I
develop on Linux and the database I'd like to use is the PostgreSQL
database on one of our Linux workgroup servers but my user base is using
Windows.  Is there a PostgreSQL module that works on Windows and Linux
or is there a port of the Windows ODBC module to Linux?

Coy Krill