Oh wait, here's why I attempted that. Step 1 is downloading all the files. Step 2 begins:
2)root with unrevoked 3.22
-open the recovery-clockwork-5.0.2.0-inc_PB31IMG download. extract it first if you need to. inside there is an image called "recovery-clockwork-5.0.2.0-inc". right click on this image,then click "copy". navigate to a directory you can easily find it,then right click in that directory,then "paste". alternatively,you can drag it from the extracted folder to a convienient spot(i personally like to drag files around,but its fine either way).
So I was trying to extract it on my PC. Hmmm....
sorry if this caused confusion.
unfortunately,for ANY file to be flashed in hboot on the incredible 1,it needs to be named
EXACTLY "PB31IMG.zip",wether its a radio,a recovery,or a whole RUU.
obviously keeping a bunch of PB31IMG files on your PC would be hard to keep track of whats what without any further description
so we keep add description to the file name to be able to keep our downloads and files straight,and then change the name at the last second,before flashing on the phone.
the part of the directions your quoting are simply telling you to take the recovery download(wich also has PB31IMG in its name,since it is an hboot flashable file) and extract it to get to the image inside. in this case extraction was needed because we wanted to put the image inside somewhere on the PC we could easily find it ,so we can point unrevoked 3.22 to it.
if we had an s-off device,we could have renamed that file to "PB31IMG" and flashed it hboot,just as we flash the whole RUU for the downgrade.
the dowgrade RUU does not get extracted,and gets renamed "PB31IMG" becasue we
are flashing it in hboot.
hope that helps clear it up some