When I right-click the file and click run, I am told:

There is no application installed for “Tar archive (XZ-compressed)” files.
Do you want to search for an application to open this file?

When I search for files on line, the following pops up in a window:

GDBus.Error:org.freedesktop.DBus.Python.xdg.Exceptions.ParsingError: Traceback (most recent call last):

File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in _inline_callbacks

result = gen.send(result)

File "/usr/lib/python2.7/dist-packages/sessioninstaller/core.py", line 1030, in _install_mime_types

path))

File "/usr/lib/python2.7/dist-packages/xdg/DesktopEntry.py", line 33, in __init__

self.parse(filename)

File "/usr/lib/python2.7/dist-packages/xdg/DesktopEntry.py", line 42, in parse

IniFile.parse(self, file, ["Desktop Entry", "KDE Desktop Entry"])

File "/usr/lib/python2.7/dist-packages/xdg/IniFile.py", line 81, in parse

raise ParsingError("Invalid line: " + line, filename)

ParsingError: ParsingError in file '/usr/share/app-install/desktop/workrave:workrave.desktop', Invalid line: - RSI (Repetitive Strain Injury) oraz wspomaga rekonwalescencju0119

I don't understand this!

I have 7zip installed which is supposed to extract this type of compressed file, but it is not offered to me when I right click on the file.

Any suggestions would be appreciated.