Bug 22215

Originally reported in Red Hat bugzilla: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=466678
Beginning with the release of Fedora 7 in May 2007, fonts belonging to Arial Narrow group began to be merged with ordinary Arial - there was no longer a separate Arial Narrow family in the font selector, only Arial. The narrow styles were supposed to be added to the Arial family, but the problem is that it is impossible to select the Narrow glyphs afterwards. With LANG=C, the situation is the least broken:
https://bugzilla.redhat.com/attachment.cgi?id=347200
Regular narrow can be selected, but narrow italic, narrow bold and narrow bold italic cannot. With LANG=pl_PL:
https://bugzilla.redhat.com/attachment.cgi?id=320146
even narrow regular is gone. Also, please note that the styles are displayed in pretty random languages.
fc-list seems to list all eight styles fine:
$ fc-list | grep Arial | sort
Arial Black:style=Normalny,Normal,obyčejné,Standard,Κανονικά,Regular,Normaali,Normál,Normale,Standaard,Обычный,Normálne,Navadno,Arrunta
Arial,Arial Narrow:style=Kursywa,Narrow,Cursiva,kurzíva,kursiv,Πλάγια,Italic,Kursivoitu,Italique,Dőlt,Corsivo,Cursief,Itálico,Курсив,İtalik,Poševno,Etzana
Arial,Arial Narrow:style=Normalny,Narrow,Normal,obyčejné,Standard,Κανονικά,Regular,Normaali,Normál,Normale,Standaard,Обычный,Normálne,Navadno,Arrunta
Arial,Arial Narrow:style=Pogrubiona kursywa,Narrow,Negreta cursiva,tučné kurzíva,fed kursiv,Fett Kursiv,Έντονα Πλάγια,Bold Italic,Negrita Cursiva,Lihavoitu Kursivoi,Gras Italique,Félkövér dőlt,Grassetto Corsivo,Vet Cursief,Halvfet Kursiv,Negrito Itálico,Полужирный Курсив,Tučná kurzíva,Fet Kursiv,Kalın İtalik,Krepko poševno,Lodi etzana
Arial,Arial Narrow:style=Pogrubiony,Narrow,Negreta,tučné,fed,Fett,Έντονα,Bold,Negrita,Lihavoitu,Gras,Félkövér,Grassetto,Vet,Halvfet,Negrito,Полужирный,Fet,Kalın,Krepko,Lodia
Arial:style=Kursywa,Cursiva,kurzíva,kursiv,Πλάγια,Italic,Kursivoitu,Italique,Dőlt,Corsivo,Cursief,Itálico,Курсив,İtalik,Poševno,nghiêng,Etzana
Arial:style=Normalny,Normal,obyčejné,Standard,Κανονικά,Regular,Normaali,Normál,Normale,Standaard,Обычный,Normálne,Navadno,thường,Arrunta
Arial:style=Pogrubiona kursywa,Negreta cursiva,tučné kurzíva,fed kursiv,Fett Kursiv,Έντονα Πλάγια,Bold Italic,Negrita Cursiva,Lihavoitu Kursivoi,Gras Italique,Félkövér dőlt,Grassetto Corsivo,Vet Cursief,Halvfet Kursiv,Negrito Itálico,Полужирный Курсив,Tučná kurzíva,Fet Kursiv,Kalın İtalik,Krepko poševno,nghiêng đậm,Lodi etzana
Arial:style=Pogrubiony,Negreta,tučné,fed,Fett,Έντονα,Bold,Negrita,Lihavoitu,Gras,Félkövér,Grassetto,Vet,Halvfet,Negrito,Полужирный,Fet,Kalın,Krepko,đậm,Lodia

The only applications that seem to be able to distinguish between the narrow glyphs are firefox and KDE's font installer.
Please let me know if I can provide any other information.