String Viewer
Description
Is a feature available for non-retail PS3 models
Accesible from an icon at XMB category 
[Settings] > [String Viewer]
Its position in settings category is defined by the settings_order 0x13 in category_setting_plugin.sprx (In XMB is displayed as the last icon most at bottom of settings category)
The name of the icon is loaded from category_setting_plugin.rco
<Text name="msg_tool_string_viewer">String Viewer</Text>
The icon launches strviewer_plugin.sprx module
There are 4 "xml object pages" inside strviewer_plugin.rco that can be loaded by the .sprx (the samples below are a reduced version with only its name and the action triggered when onInit):
<Page name="page_strviewer_lang"... onInit="event:native:/OnInitStrViewerLang"... <Page name="page_strviewer_plugin"... onInit="event:native:/OnInitStrViewerPlugIn"... <Page name="page_strviewer_id"... onInit="event:native:/OnInitStrViewerID"... <Page name="page_strviewer"... onInit="event:native:/OnInitStrViewerDialog"...
String Viewer supports multilanguage. The page page_strviewer_lang contains a list of languages associated with letter codes, see: Talk:Languages
Speculation
Maybe is posible to make visible the icon in some PS3 models by using a Button Combo
Pre-retail firmwares
In old firmwares can be seen how string viewer was loaded
Code Sample
When adding this entry in a modern firmware and clicking in the icon, appears an error message asking for strviewer_cnf in dev_usb000
More info: http://www.psx-place.com/threads/string-viewer-and-decr-0-90fw-xmb-items-partially-working.17313
