Well this looks OK in the preview. Let's hope it will work for real.
DADGAD fretboard chart
D A D G A D
+--------------+
¦ ¦ ¦ ¦ ¦ ¦
+--+--+--+--+--¦
E B E A B E
+--+--+--+--+--¦
F C F ¦ C F
+--+--+--+--+--¦
¦ ¦ ¦ B ¦ ¦
+--+--+--+--+--¦
G D G C D G
+--+--+--+--+--¦
¦ ¦ ¦ ¦ ¦ ¦
+--+--+--+--+--¦
A E A D E A
+--+--+--+--+--¦
¦ F ¦ ¦ F ¦
+--+--+--+--+--¦
B ¦ B E ¦ B
+--+--+--+--+--¦
C G C F G C
+--+--+--+--+--¦
¦ ¦ ¦ ¦ ¦ ¦
+--+--+--+--+--¦
D A D G A D
+--+--+--+--+--¦
I now use Linux on my home PC and Linux saves these diagrams as they are. I created then in Windows and found that the default encoding in Windows means it does not save these charts well. You should be able to copy the chart into a text editor like Notepad. If you just try and save it you will get an error message and the chart will change to dashed lines. Instead of Save use Save As and look for the encoding box. Change it from Ansi to Unicode or Unicode 8.