How do I add a shortcut to the Unity Dash?

I know how to create a .desktop file in ~/.local/share/applications/ and add it to the Launcher (just drag it from Files onto the Launcher), but the problems are:

1. I can't find the shortcut via Dash. Typing its name reveals nothing.


2. The shortcut is gone from the Launcher after a reboot.

The instructions at Adding a .desktop file to the Unity Launcher just don't work. My files validate, and I've run desktop-file-install, but they still don't show up in the Dash search.

I'm on Ubuntu 16.04 and here's the contents of the .desktop file:

[Desktop Entry]
Comment=FB2K
Terminal=false
Name=Foobar2000
Exec=wine /c/Utils/foobar2000/foobar2000.exe
Type=Application
Icon=/c/Utils/foobar2000/foobar2000.png
Categories=Music;AudioVideo;
Hidden=true