The key letters here are W (+H +D) for WHDLoad, A for Amiga, R for Renaming, and P for Project.
As far as I can see, there is just no suitable acronym that hasn't already been used. I suggest a less strict form for the name, along the lines of the mid-90's trend for software applications of combining upper and lower case into a word. This is similar to Codetapper's suggestion, and imo is the only way to produce a 'catchy' name while avoiding calling it, erm, 'WANC'.
My humble suggestions:
AmiWR (+P maybe)
You get the idea.