program generate thumbnail for 7z & cb7?

[ajfudge]

Surprisingly, I am quite arrogant when it comes to archive files and I favor .7z over .rar and .zip.
However, I am quite frustrated that I can't find a program that can generate thumbnails of .7z or.cb7 files, something which has been impelemented already to zip and rar by program such as CBX Shell. If anyone knows of a free program that does this to .7z, please share. Portable is preferred. Thanks.

[loin2kolpotoru]

I am seeing something like this for the first time.