I also discovered a bug in system ninja v2.3.4 which messed up the dotNET4 client files (corrupted) after cleaning junk files.
I reinstall the dotNET4 client, all files returned back to normal, but when I re-clean the junk files, the dotNET4 client files get corrupted again.
This does not apply to system ninja v2.3.3 though (clean).
Thanks and regards.