When saving an attached file with a name containing a #, the file name is cut off after the #, including it in the "save as" dialog. E. g. "OPG 16.01.2014 #2.jpg" becomes "OPG 16.01.2014 ".
I will investigate it.
Still present in 4.12.2
Git commit 4b0231304bdf06ed7150cd5337904b375b38fb6b by Montel Laurent. Committed on 10/02/2014 at 12:24. Pushed by mlaurent into branch 'KDE/4.12'. Fix Bug 330880 - Names of attached files containing a # are not handled correctly FIXED-IN: 4.12.3 M +3 -1 messageviewer/utils/util.cpp http://commits.kde.org/kdepim/4b0231304bdf06ed7150cd5337904b375b38fb6b