Dear all:
I wanted to replace the existing thumbs for known filetypes (e.g. .doc/.xls/.ppt/.pdf/...etc.) with my custom thumbs files. Had found and replaced the existing thumbs jpg files inside the "/in-includes/images/thumbs" folder. However, that didn't seem to take my new thumbs into effect at all, even though I had also refreshed my system cache, too. Did I miss anything or what else needed to done as well? Many thanks for your kind advice in advance.