Enter the index for the specified icon if there is more than one icon resource in the file.

A nonnegative integer refers to the order of the icon resources in the executable. For example, 0 is for the first icon in the file, 1 for the second, 2 for the third, and so on.

Use a negative number to refer to a specific resource ID. For example, the icon index -12 points to the icon with a resource ID of 12.