Is there a filebrowser that features a preview pane to preview Ascii files and images? Can I do that with nautilus? I'm looking for something similar to the Windows 8 file explorer. There you can preview ascii files, images, pdfs, etc.
Both Nemo and Nautilus have preview functionality. In both cases follow the menu Edit > Preferences and then select the Preview tab. In Nemo the dialogue looks like this:
Tweak these settings to your liking. Previews are portrayed for text files,
The previews are shown as the file icons, therefore you must make sure the Icon View is set as default in the Views tab: