To answer the question:

This method will launch the game within the emulator. It's not a "WAD" in the sense of a standalone channel, but it is the most functional way to play.

The most notorious problem with Diddy Kong Racing injections is the water rendering—it often displays as flashing different colors rather than looking like normal water. While this is mostly a visual annoyance rather than a game-breaking issue, it can make some tracks less immersive.

Why go through this trouble for Diddy Kong Racing ?

Before we discuss compatibility, let’s clarify the terminology. On the Wii, a (derived from "Wii Wad" or possibly a technical acronym for "Wii Archive Data") is an installation package. Nintendo used them officially for WiiWare titles and Virtual Console games.