No, you cannot display icons at all in a NSTextFieldCell. That is why you would subclass it. How many you can display depends on how you write the subclass. If you do not understand what subclassing is, you need to get a book and learn Objective-C.
If you just want file icons in your table, use an Image Cell for one of the columns.
NSWorkspace's iconForFile: will get you the icon, if you have a path.
Just store that image in your datasource for the table and call NSArrayController addObjects: once you've stored all the icons you want.
IKImageBrowserView is overkill for this simple situation.
Apple provides all the documentation you need, tons of sample code, there is a programming course on iTunes University, there are plenty of places where you can learn.
Have you ever written code to display Icon in one column?
Doing so will start to give you a proper grounding for learning to display arrays of images with an IKImageBrowserView.