Decrypting a tar.gpg archive file with standard settings apparently works:
But after clicking "Save all", there is no further information shown to the user and no new Folder appears on the USB stick.
Debugview shows:
[8136] org.kde.pim.kleopatra: Moving "C:/Users/g10code.WIN-TEST3/AppData/Local/Temp/kleopatra-AtABCN/Program Files (x86)" to "F:/Program Files (x86)_1" [8136] org.kde.pim.kleopatra: [8136] org.kde.pim.kleopatra: Error: "<html><p>Die Datei ‘<tt>C:\\Users\\g10code.WIN-TEST3\\AppData\\Local\\Temp\\kleopatra-AtABCN\\Program Files (x86)</tt>’ kann nicht nach ‘<tt>F:\\Program Files (x86)_1</tt>’ verschoben werden.</p>\n\n<p><i>Zugriff verweigert auf F:/Program Files (x86)_1.</i></p></html>"
(Note: That is F:\ and not C:\)