Or it can be a ArcView Optional Index File, go check further down on this page:
http://www.filext.com/detaillist.php?extdetail=ain&goButton=Go
Scroll down, AIN is not only compressed file, it can be ArcView optional index file too. Go download GIS Info and check if the file is openable with that software and you can perhaps check the content of the files.
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