since some days my Files lens opens only nautilus but not the correct application which is associated with the file extension.
For example, if I choose a PDF file, Nautilus is openend, pointing to the directory there the file is (and the file is selected) but Adobe Reader is not opened.

Then I do the same in the terminal with

xdg-open sample.pdf

only Nautilus is opened too.

xdg-mime shows me this info:

$ xdg-mime query default application/pdf

acroread.desktop

The /usr/share/applications/acroread.desktop file:

[Desktop Entry]

Name=Adobe Reader 9

MimeType=application/pdf;application/vnd.fdf;application/vnd.adobe.pdx;application/vnd.adobe.xdp+xml;application/vnd.adobe.xfdf;

Exec=acroread 

Type=Application

GenericName=PDF Viewer

Terminal=false

Icon=AdobeReader9

Caption=PDF Viewer

X-KDE-StartupNotify=false

Categories=Application;Office;Viewer;X-Red-Hat-Base;

InitialPreference=9

The same with other file types like images, music files and office documents.

Then I doubleclick the file in Nautilus everything is ok and the correct applications are opened.

I assume this behaviour has something to do with Thunar which I've installed some days ago but deinstalled after these problems.

Any suggestions?