I'm working with QTP 9.5 now. I found some Infragistics .Net controls dll under <QTP_home>\bin. Why they are in this path. I know the QTP don't support the Infragistics controls directly.
You are right; QTP doesn’t directly support testing of Infragistics control. The reason those NetAdvantage assemblies exist in the bin folder of QTP is that the user interface of QTP IDE is built with Infragistics NetAdvantage controls.
Huh, Infragistics is so powerful.