This document is updated regularly.
Attempts to use the default control panel applet under Windows 95 et al will throw a stream of errors. This is because the applet would like to use the Services manager and Win9x doesn't have one. A fixed control panel applet is available for download from here. It contains a readme with more information and installation instructions.
This bug was introduced with Firebird 1.0.2. It is fixed for Windows clients (gbak, gfix) in Firebird 1.0.3 but is still not fixed for Linux clients.
The problem does not affect servers, ie, a Windows gbak can use the /SE switch to connect to the Services Manager of a Linux Super Server instance.