I would increase the zoom level in document's detail page on Alfresco 4.2.c. The article refers to a newer version of Alfresco and for this reason, i suppose, it doesn't work. If i do exactly what is described there then i cannot see the document preview and the buttons in preview box are not responding…
I think with a little effort i could solve this issue…does anyone have an idea on how to modify the PreviewerClass.as ?