Files with iap file extension might be found scripts for Iguana Active Server solution. Probably old.
There is one other file type using
the IAP file extension!
.iap - Infinity Engine automatic installation package file
IAP file extension - Iguana Active Server active page script
What is iap file? How to open iap files?
File type specification:
The iap file extension is associated with the Iguana Active Server, a remote application monitoring and management tool, developed by ILan Games. Seems like old format and no longer supported.