Following are the instructions to a create context menu "Open with GVim" entry in KDE Dolphin file manager.
Create a service menu file with the following contents. Give the file any meaningful name. I named it "open_with_gvim.desktop".
[Desktop Entry] Type=Service ServiceTypes=KonqPopupMenu/Plugin MimeType=all/all; Actions=OpenWithGVim X-KDE-Priority=TopLevel [Desktop Action OpenWithGVim] Name=Open with GVim Icon=gvim Exec=gvim %u
To install this service menu for all users copy the file to the following location.
Fedora 23 (KDE 5)
# cp open_with_gvim.desktop /usr/share/kservices5/ServiceMenus/
Fedora 20 (KDE 4)
# cp open_with_gvim.desktop /usr/share/kde4/services/ServiceMenus/
Restart Dolphin and when you right click on any file "Open with GVim" context menu will be displayed.