Files that contain the .isn file extension are most commonly associated with installer source files. These files contain listings of the files that are used by the Installshield utility when the utility is installing software applications on a user's computer.
When a user starts to install an application using Installshield, the Installshield utility will use the ISN file to complete the application process, referencing the file to find out where and how to install the application that is associated with it. Without the necessary ISN file, an application will not be able to install properly on a user's hard drive.
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If you have additional information about the ISN file format or software that uses files with the ISN suffix, please do get in touch - we would love hearing from you.