I've got an image file of a hard drive from a client that wants a database extracted out of it. The client does not know any details except that the database was once installed on the server from which the image was created.

I found out that it is a UNIX system with a Informix DBS installed, but I am unable to find any database files. I'm not sure about the version of Informix, but it seem that it was installed around 15 years ago.

I'm not able to boot from the image. I'm just viewing the files.

Do informix database files have an extension and what could it be? Any other tips how to identify the database files?