fairly easy - nedit's .desktop is missing something to allow it to be shown in the r. click context menu
Code:
gksudo gedit /usr/share/applications/nedit.desktop
find the Exec= line & add a %f to end, leave a space between nedit & %f - ignore the untitled document 1 that also opens - close it without saving, do save the nedit.desktop
Code:
[Desktop Entry]
Version=1.0
Name=NEdit
Exec=nedit %f
Icon=Nedit
Terminal=false
Type=Application
Categories=Motif;Utility;TextTools;
GenericName=Text editor
GenericName[en]=Text editor
GenericName[nl]=Tekst verwerker
Then you'll find it by right clicking on your file > open with > other applications
After that it will be shown directly in the r. click menu
If you wish to set nedit as default for all text files then use the right click > Properties > open with instead
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