Ok I think I figured out the problem. I unzipped and opened the DAT in a text editor and found that the flyers are all one "set". So basically I had to put the files in a folder, and put that folder inside *another* folder, and set *that* folder as the ROM-Path. It now finally gives the expected output. Whew! So that leads me to another couple of questions:

1. Isn't there some way to get ClrMamePro to properly verify and clean up file collections (such as the flyers, control panels, etc.) just as they are stored online, without having to go and unzip them all or rezip them all into one zip file first? So that basically you just download the zipped packs just as they are into a single folder, and run them through ClrMamePro to get a clean, current set? Without all the extra steps.

2. Is there any simple way to determine the structure of a DAT file's contents (other than adding even *more* steps to the workflow, ie unzipping the DAT and opening it in a text editor), so as to determine just how you need to organize your files *before* scanning? (Especially if the answer to question 1 is "no".)

3. One final curiosity: if I unzip the flyer packs and toss the flyer files all into one folder, CMP reports 0 missing and 18 wrong named, which appears to be normal. If I instead try to save a step and unzip each of the four flyer zip packs and put the four resulting folders into the "flyers" folder, CMP reports 3 unneeded files (cbtime.png, tmnt.png, and vsgradus.png), and 2 missing files (btime.png and gradius.png, neither of which are actually missing). None of those were among the 18 listed as wrong named in the other method of scanning. Plus, the summary says 3 of 2578 missing, even though the details only list 2 missing files...when both should say 0. Very inconsistent...(and note the similarity between the file names of the unneeded files and the missing files...very peculiar)

Unless I am grossly misinterpreting the results and misunderstanding how the app works, it seems to me that ClrMamePro apparently expects the files to be *just* so, perfectly organized, to avoid any bizarre errors such as this...which sort of seems redundant with CMP's purpose in the first place. If anyone can set me straight on the questions above, please do so. Thank you! :)