Currently browsing a zip archive is though immensely handy feature of XnView but it leaves thousands of temporary extracted files and those are NOT deleted (which alone is a bug of course).
But the main thing is that since it's very easy to extract archived files to a RAM space (as far as I know all modern unzip/etc libraries allow do that), XnView would substantially improve user friendliness of archive browsing in terms of: (no) disk space used, ergo far more speedy building of thumbnails(!).
A somewhat related (and mentioned a few times before) aspect of archive browsing is a behaviour of the Enter / doubleclick hotkey on the image displayed which belongs to an archive. Currently it's counter-productive (it shows TEMP folder of the Windows) whereas isn't it an obvious improvement to let the browser regain focus of the archive being explored?
[Suggestion] In-memory extracting of archives
Moderators: helmut, XnTriq, xnview