bug#24669: 25.1; Cannot display images

[Drew Adams]

> (I wonder if some such info should be, or maybe already is, in
> the doc somewhere.  You will likely tell me that it is in the
> Windows README or some such, but I'm thinking of someone who
> just picks up an Emacs binary.  Should this be in the Emacs
> manual (or is it already)?)

Just which of the directories in that zip archive need to be included in my 
PATH variable?  All of them?  (Including only bin/ is apparently not 
sufficient.)