Desktop file is not getting associated with application

Question

I created a .desktop file for my Qt application, but it still doesn't becomes available in Dash, and default icon is getting displayed when I'm running it manually:

[Desktop Entry]
Categories=Network;Qt;FileTransfer;RemoteAccess;
Exec=myapp
GenericName=My Application
Comment=My Application Descr
Icon=myapp
Name=MyApp
Terminal=false
Type=Application

What I have already tried to do:

• Reading dozens of tutorials related to that topic
• Moving this desktop file to /usr/share/applications/myapp.desktop
• Moving an icon to /usr/share/icons/hicolor/128x128/apps/myapp.png
• Running desktop-file-validate myapp.desktop - doesn't prints any errors
• Running sudo desktop-file-install /usr/share/applications/myapp.desktop
• Running sudo update-desktop-database
• Logging out

But still no luck.

Is there any way to debug this issue? Also, do I understand right that Unity uses executable name in order to establish an association with a desktop file?

Answer 1

Finally, the following helped:

1. Adding StartupWMClass=myapp in my .desktop file (it's possible to figure out a one by using xprop WM_CLASS)
2. Placing icon in /usr/share/pixmaps/ instead.