I like a weird mystery so decided to take a look.
You can prevent ResEdit from trying to
display thumbnails of the list of PICT resources (and therefore maybe crashing if there’s junk in there) by opening the “PICT” resource type icon while holding down the Shift key, or by typing Shift-Return. This gives the list at left, you can see “plus”, “classic”, etc. which I presume ought to be the PICTs for each bare logic board.
You can then open a PICT resource to look at the raw data by choosing “Open Template…” and leaving the default template type of “PICT” in place then hitting Return. That gives me, for example, the data on the right.
I can see immediately that this is not a normal PICT: the Rect is invalid (those coordinates are top, left, bottom, right, in that order … you can see the image is weirdly tall with bottom - top almost 8000 pixels, and the right is less than the left, which shouldn’t be possible).
You can do something similar in Resourcerer by clicking the PICT type name from the list, then pressing Cmd-1 to turn off “Show PICT Data” and then opening the resource by clicking “Data” instead of “Open”. This gives the error shown in the second snip below, confirming that these are not properly parsable sets of PICT opcodes.
My guess is these are actually bitmaps, or maybe
portions of a valid PICT that Snooper stitches together on the fly to create those logic board images. I don’t think it will be possible to directly extract the images from these without some sort of processing.
I would suggest just using Cmd-Shift-3 to grab screenshots while running Snooper.