thumbnail mode small icons of folder

[Ganz]

Why in thumbnail mode  the spec. icons  for a folders are so small - they have size of icons in Det. view mode?
but icons for ".exe"- files all is ok (if it has a big icon, 128 or 256 px..)
that my folders have icon resolution 256*256 or 128*128,  and size of thumbnails size 128*128 px...
in windows expolerer is ok - special icons of some folders have size  that other folders, and scalling...

ps sorry 4 my english

[Mathias (Author)]

MC ask windows for the thumbnails. Not sure why it returned them like that.. Do some of the folder have user specifics icons ?
I think it happen since it does not find a thumbnail from the thumbnail system for the folder so it takes the icon instead