Thunar’s icon factory currently uses a fallback icon located under /usr/share/pixmaps/Thunar/Thunar-fallback-icon.png. Aside from the fact that it is visually displeasing it doesn’t allow for any scaling to different icon sizes at all. Thus Thunar should use the default icon for unknown types from the icon theme just like it did in 1.0.2. This could be the GTK_STOCK_FILE stock icon.
Fixed in master: commit 1546ba7e153afe23443b7ee0ecb0c483166e2642 Author: Jannis Pohlmann <jannis@xfce.org> Date: Sun Nov 14 02:36:36 2010 +0100 Use GTK_STOCK_FILE as the fallback icon for files (bug #6662). As a consequence, we no longer need the fallback icon. It is thus removed from the repository.
(In reply to comment #1) > Fixed in master: Awesome, thanks!
*** Bug 6397 has been marked as a duplicate of this bug. ***