Is IBM Informix Client SDK supported on Windows 7?
Yes, IBM Informix Client SDK is supported on Windows 7 starting with version 3.50.xC6. While the Release Notes for version 3.50.xC6 do not mention Windows 7 as one of the valid platforms, we have tested and certified it on Windows 7. Subsequent releases of IBM Informix Client SDK, starting with version 3.50.xC7, will contain Windows 7 as one of the certified platforms listed in the Release Notes.
See URL below for link to download IBM Informix Client SDK.