Folder thumbnail not the first picture

[delta]

I noticed that the folder thumbnail is not always the first picture in the folder: If the first picture starts with an underscore (_) it's not taken as folder thumbnail. On the other hand the thumbnails inside the folder are sorted correctly: the underscore pictures come first. That's especially annyoing when you actually mark the folder thumbnails with an underscore. Well, I converted to the hyphen. However, is that a bug or a feature?

Thanks btw for the excellent support here! *thumbsup*

[xnview]

Yes, i use the first file found, not the first ordered file

[delta]

Hm, just curious: is there any way to tell what file will be found first? Files that start with a hyphen (i.e. their file name) seem always to be found first, no matter if they are the first relative to a 'lexikographical ascii ordering'.