"Open with other application" crashes on .theme files

[deutrino]

I downloaded a GNOME mouse cursor theme and decided to see if Mint could install it from the Files browser, by right-clicking the index.theme file.

Up popped a dialog box titled: Select an application to open "index.theme"

It contained the text:

No applications available to open "index.theme"
Click "Show other applications", for more options, or "Find applications online" to install a new application.

So, I clicked the "Find applications online" button. The first time I did this, it failed and complained that the 'aop-install-data' package was needed to handle MIME type decoding, or something along those lines (not an exact error message). So I installed that package and tried again, once more getting to the dialog and clicking the "Find applications online" button.

Actual behavior:

After searching a while, it crashed and popped up a dialog titled "Failed to look for applications online" which contains a Python traceback:

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 rekonwalescencj\u0119

Expected behavior:

The search should come back with either no results, or usable results, and not crash.

Release: Linux Mint 15 "olivia"
Edition: Cinnamon 64-bit