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IECompat entries relate to the Internet Explorer compatibility list maintained by Microsoft. See Internet Explorer Compatibility.

Browser Forensics > IECompat > iecompat.png

iecompat entries in NetAnalysis v1.5x

C:\Users\{user}\AppData\Roaming\Microsoft\Windows\IECompatCache\index.dat 
C:\Users\{user}\AppData\Roaming\Microsoft\Windows\IECompatCache\Low\index.dat