Created attachment 123225 [details]
Other example of a saved file impossible to re open

SUMMARY
Concerne Ksudoku 19.04.0


STEPS TO REPRODUCE
1. Open a new play
2. Save the non finished play
3. open the saved file 

OBSERVED RESULT
ksudoku cannot read the saved file :
"impossible to read the line 1 of the xml file"

Same for 10 different filed saved

EXPECTED RESULT
Open the saved play and finish it

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.15.4
(available in About System)
KDE Plasma Version: 5.57.0
KDE Frameworks Version: 5.57.0
Qt Version: 5.12.2

ADDITIONAL INFORMATION
example of a saved file :
<!DOCTYPE ksudoku>
<ksudoku>
 <game msecs-elapsed="24925" had-help="0">
  <puzzle>
   <graph order="9" type="sudoku" specific-type="Plain"/>
   <values>d___b_c__h__i_f____b__c_____hd_f__e_e__d_j__f_f__h_jd_____e__f____g_c__d__j_d___i</values>
   <solution>difhbecjghjcigfdbegbejcdfihjhdcfgiebecbdijhgfifgehbjdccdhbeigfjfeigjcbhdbgjfdheci</solution>
  </puzzle>
  <history/>
 </game>
</ksudoku>