Execute script on login Fedora 21

I'm trying to launch a script located in my home directory when I login on Fedora 21. I have tried to make this desktop file in /usr/share/autostart

[Desktop Entry]
Type=Application
Name=Wallpapers
Exec=/home/user/Wallpaper-script/launch.sh
Comment=Autostart wallpaper download and slideshow
Terminal=false
X-Desktop-File-Install-Version=0.22
OnlyShowIn=GNOME;

When I reboot or login, the script doesn't launch; however, when I manually open the file, the script launches fine. What am I doing wrong here?

I can supply the script files if necessary.

Figured this out. Just had to put the desktop file in ~/.config/autostart and then it worked like a charm. Thank you so much for the help though Hastur. If anyone is interested in the script, an installation one is available here Link