Kupfer make wrong understanding of "OnlyShowIn" attribute in .desktop file

[laspanding]

I'm under xfce4 desktop environment. There are some ".desktop" files in "/usr/share/applications/", contain "OnlyShowIn=XFCE;" So it will not appear in the other DE menu (Gnome etc.).
These ".desktop" shortcuts shown normally in the main menu in XFCE4. But when I typed them in kupfer I found nothing. Does Kupfer simply recognized "OnlyShowIn" as "NotShowIn" ?
I think it is a serious problem and need to be fixed asap.

python-gobject/quantal-updates uptodate 3.4.0-1ubuntu0.1
python-gtk2/quantal uptodate 2.24.0-3build1
gvfs/quantal uptodate 1.14.0-0ubuntu6

UPDATE: "NotShowIn" not work as it should be either!

[Karol Będkowski (karol-bedkowski)]

Thanks for reporting this problem.

Confirmed in Ubuntu
Works fine in Debian.

[Karol Będkowski (karol-bedkowski)]

Update.

Please check configuration of "Application" plugin.
You can select your desktop environment.
Please change this setting, close kupfer, clear cache (rm -f ~/.cache/kupfer/*) and check again.

[laspanding (laspanding)]

Change the configuration of "Application" plugin does fix the problem. Thank you.
But I'm using another desktop environment call "MATE" in my second computer, that is a folk of gnome2. And today I heared about E17 team have released their official version,I think many people also want to have a try. So would you please add these two DEs in the configuration ?

[Karol Będkowski (karol-bedkowski)]

I've added Mate and Unity to configuration.
Also, I have added "universal" desktop environment.