Search:

find an app (something like this flash to video encoder pro) with an option of dvd burning. it will convert your files and burn them! but! it is impossible to convert a menu or other navigation....

or use something like flash fetcher...

you need to download a special tool for flash to mp4 conversion. for example flash to video encoder can do it.

you should use video to flash converter
for example try
http://www.geovid.com/Video%20to%20Flash%20Conversion

may be Flash to Video Encoder PRO by geovid.com will be helpful for you

have you tried converter by geovid?
i'm using it and don't have problems with quality

may be you should just try to use another converter ;)
I can for example recommend this video 2 flash converter
may be it will help you