Comment 12 for bug 475889

The problem remains if both Arial and Arial Narrow are copied from a Windows installation.

Attached are two screenshots from gnome-specimen:
With both Arial and Arial Narrow installed, duplicate entries are shown, and both show the regular variant.
With only Arial Narrow installed, the font is rendered correctly. The font name above the example is Arial Italic Condensed, but the tree view only shows "cursief" (Dutch for Italic)

If I remember correctly, on 9.04 the font was correctly recognised, and both the regular and narrow would show up under Arial in the tree view.