Make IrfanView ignore text files or other file types?

I just installed IrfanView and while viewing images, I notice IrfanView iterates text files as well as image files. How do I make it NOT include text files (or other kinds of files) in its iteration?

In Irfanview, go to Options menu | Properties/Settings | Extentions. Now,

Option 1

• Check the boxes for the file extensions you want to associate with Irfanview
• Select the option "Load only associated types while moving through directory".

Option 2

• Select the option "Load custom file types".
• Carefully copy and paste the long text string into Notepad or another text editor; now you can more easily examine and edit the chosen filetypes.
• Remove the TXT| substring.
• Copy and paste the long text string back into the textbox in the Properties dialog.