set folder thumbnail to first image file found in folder, e.g. *jpg

hi

I wanna set thumbnails for my folders in the thumbnail view of the video section in xbmc. I found I can make a file, name it advancedsettings.xml and paste this into it:

<advancedsettings>
<dvdthumbs>
<add>*.jpg|v*.jpg</add>
</dvdthumbs>
<advancedsettings>

this is how it looks in notepad. I hope this is correct syntax. But apparently, the * signaling any file name is ok doesn't work. Anyone knows how to force this behaviour from xbmc? Can I just leave type <add>.jpg <add>?The file names of the thumbs I made are mostly the name of the video file, with 'a _s' attacted to it. But in general, there is only one thumb in the folder, and xbmc should pick that one, regardless of a specific file name. Someone any ideas?

greetz

r

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Or if anyone knows a tool that renames all .jpg files inside subfolders to e.g. folder.jpg, the problem is also solved... .