This is on AMD64 Gentoo, but I doubt that platform is unique.
I only just installed Dolphin today or yesterday, another file manager for KDE, but at least the not being able to go into a write-protected archive seemed to be the case. So Dolphin is affected, as well.
Krusader must install some kind of plug-in for handling archives, a plug-in that was designed by a team of untrained wallabies. It screwed up a bunch of zips of free fonts, which fortunately I could easily replace from the original sources. Krusader didn’t seem to corrupt the contents of an archive, but rather to write it out as a new, slighly larger archive, with invalid CRC data, so it probably didn’t destroy any ‘important’ data, but who knows what fecal matter was waiting to be stepped in, had I left Krusader installed.
Maybe Krusader was written by a team of ‘thinkers’ at the American Enterprise Institute.