Here's a little brainstorm (merely for myself) in order to find what's going on here. See the bottom under the double line for more to the point stuff.
I do not now what the xx.dat means. i have seen it before and i alway's thought it must be a hidden file or something that xx ad to the folder.
but now trying and opening the galery structure aswell the origin data maps they do not come up. And i forgot how i can show the hidden file's. When i open such a XX.dat with kladblok a whole other cd is written in there. And it looks strange but with every cd i try the pic below with the same cd and track is written in there.
I read this again, and I thought that at clarifying a bit from my side, you can better determine what is going on.
The XX.dat is normal and it is used internally a.o. to keep track of what you played (in the end the data in that file goes to !Played.PLXX).
FYI, this must go this strange way, because remember, Engine#3 is running (or can run if you want) completely on its own and it does not take care of playlists etc.; it just plays. 
The XX.dat is held in your current XXHighEnd folder (not the by you appointed Data folder !), that is, I wouldn't know of a way to let it end up elsewhere.
One exception to this : when you'd be able (but are you ?) to start XX by means of file associations (double click on a music file from within Explorer), yes, then the XX.dat would end up in between the music data.
The latter not assumed, what you look at in the (right) CoverArt pane just *must* be the contents of your current XXHighEnd folder. Or at least, partly (for the XX.dat part). Why "partly" ?
... because the XX.dat can't be somewhere else than in the XXHighEnd folder, and because the Folder.jpg shouldn't be there.
The latter is a bit more difficult to interpret, because most probably it just *is not* there, but, what you see in that right pane is just everything XX found for coverart data. Btw, with richtclick on such an item - Show Location you can see where the files really are.
Generally you can say that XX looks for coverart for the current album in the folder of that album, one folder above it when it's a multi volume (the name of the album one folder up), and all the folders below the folder from the album. Knowing this, we now can look again at the structure I gave you :
D:\
\Music
\Album1
\Album2
\XXHighEnd program
by mistake I had Album1 twice in the earlier post)and actually all should be able to cope with this (so this example is wrongish). This sure would not work :
D:\
\Music
\Album1
\XXHighEnd program
\Album2
because Album1 would come up with the data files from XXHighEnd.
I assume that you sure do not have a structure like the latter because
a. it wouldn't explain why all your albums don't work;
b. the XX.dat can show up only with Album1;
c. there's a lot of files more in the XXHighEnd folder.
So here's my conclusion (for now
) :
You must indeed be starting XX from explorer and file associations, because then the behaviour would be so that each album shows the XX.dat.
But then I don't believe you do this, because1. this was discussed before (which you know) and it doesn't work really;
2. (I think) it would be too much hussle at a new version.
What can I conclude more ?
Well, apart from nothing, I recall that I saw the XX.dat myself somewhere where it shouldn't be. And let's keep in mind : the XX.dat only should be in the current XXHighEnd folder, and nowhere else (also, XX so far never wrote anything to your precious source folders
(but that will change in the next version haha), which I really wouldn't dare without telling). But ... it can well be that somewhere there's a mistake in the program ...
Ok, at this stage of my reasoning, I suddenly realize that XX.dat doesn't even exist anymore in the program. So, what you bump into (must be "here and there") is from a very old XXHighEnd version (November 2007 or earlier). So here we go ... the whole thing is unrelated, and the subject is invalidated.
Now I REALLY don't know.
The capital F doesn't matter (but I will look whether I made a mistake into that one).
Maybe it makes a difference when you tick Simple Search (Settings Area) ? It shouldn't matter, but at least then the only thing which is (and explicitly) looked for is folder.jpg, which also is equal to before 0.9v-2. When Simple Search is not ticked things are way more complicated and everything could go wrong ... weren't it that here I don't have a problem with it.
Gerard, forget about my earlier questions, but please try the Simple Search checkbox and let me know.
Thanks,
Peter
