[Estimated Reading Time: 4 minutes] As far as I can tell, as of Delphi 2010 at least it is impossible to deploy a DBExpress application without also deploying at least one dbxdrivers.ini. Furthermore, deciding where this ini file has to go is a minefield, and the DBExpress architecture smells very badly in this area.
[Estimated Reading Time: < 1 minute] Another commercial Delphi component vendor has apparently decided to pursue a direction that no longer involves supporting at least some of their Delphi components on a commercial basis. Fortunately in this case they have decided to open source their products. So, if you are using the Luxena DBExpress drivers for Informix, these and related supporting code can now be obtained from the Google Code links, below.