This is the ‘Loading … 5′ result from a Corona project. The .png and .fnt are generated with bmGlyph, and it is pretty easy to use them in a Corona project.
An exemple project can be found here: http://developer.anscamobile.com/forum/2011/02/05/bitmap-font
Basically, you need to get the bmf.lua class from the URL above, and use the following code:
local bmglyph = bmf.loadFont( ‘myfont.fnt’ )
local string = bmf.newString(bmglyph, “blablabla”)