Thunar accidentally replaced Nautilus as Gnome's default window manager!
 

I was messing around with different GUI sessions, and I wanted to try XFCE. Well, I switched to XFCE for a session, and I played around in it. When I went back to a Gnome session, however, it appears that Thunar is now the default filesystem explorer.

That's very annoying.

When I...

Places > Home Folder

I get the Thunar explorer. I want the Nautilus explorer. How do I fix this issue?

OS: Debian Sid

Create new folder on the desktop,right click on it > Properties > Open With > select Open Folder.

That didn't work, so I decided to apt-get remove thunar.
Afterwards, I tried switching over to Open Folder from what you said.
Things seem to be working smoothly now.

Yes,removing Thunar is something that I would suggested if things didn't worked,but only if you did log out and log back in or restarted the PC after applying the changes that I've suggested.

What if I don't want to remove Thunar? Say I am running Compiz Fusion standalone, I JUST want the XFCE panel, but Nautilus to handle the desktop and file management. How can I fix this without removing thunar, since my main menu depends on it?

Well,I guess you just have to install and use Nautilus as your file manager.

No. I have that installed. But the File Manager menu item in the Xfce menu ALWAYS runs Thunar. How do I change that?

Will you explain this a little better?
Also,what's your distro?

Let's skip a few unneeded steps. I use Arch, but what I need to know is absolutely not reliant on my distribution: How do I edit the Xfce menu?

OK,let's close this thread,go here.