No, it's all java archives.
Use file:// as URL and check for /pronto/data/inet

./intent/pronto/data/inet:
2017996 9 -rw-r--r-- 1 502 246 9305 Jan 1 1970 bg.jpg
2020156 0 -rw-r--r-- 1 502 246 323 Jan 1 1970 deathstar.html
2020364 0 -rw-r--r-- 1 502 246 206 Jan 1 1970 iblocks.html
2020524 247 -rw-r--r-- 1 502 246 253009 Jan 1 1970 iblocks.jar
2268376 0 -rw-r--r-- 1 502 246 198 Jan 1 1970 icalc.html
2268532 8 -rw-r--r-- 1 502 246 7689 Jan 1 1970 icalc.jar
2274892 60 -rw-r--r-- 1 502 246 61558 Jan 1 1970 ipronto.bmp
2309048 0 -rw-r--r-- 1 502 246 198 Jan 1 1970 isame.html
2309204 197 -rw-r--r-- 1 502 246 201680 Jan 1 1970 isame.jar
2508764 0 -rw-r--r-- 1 502 246 85 Jan 1 1970 loaderror.htm
2508844 18 -rw-r--r-- 1 502 246 18681 Jan 1 1970 loaderror.jpg
2526268 0 -rw-r--r-- 1 502 246 87 Jan 1 1970 lowmemory.htm
2526352 20 -rw-r--r-- 1 502 246 20039 Jan 1 1970 outofmemory.jpg

This filesystem is CRAMFS which is readonly. So the flash image would need to be modified and flashed. Unless I have my JTAG interface running I won't play with this. I plan to buy another iPronto to totally disassemble and set up a development system with JTAG connection.