InfoPath Dev

Hey guys- So, I published a form with code, to our SharePoint 2007 farm in Forms Services. Everything worked alright and the form does exactly what it's supposed to be doing. Now, I want to change the form and maybe some of the back end coding. I don't have the source files. I mean, since I published the form to SharePoint, a document management system, I didn't think I would need to keep a separate, local copy of the files and the associated source code, since I could just download it from the server later. I don't seem to be able to do that. Does anyone have any advice or suggestions on how I go about getting a copy of the form and the associated code project? Thanks!

well i guess it is not that easy,

the form you delpoyed contains dlls of your code, so you cant just go and make changes to your code because you dont have the code. There is some utility available that can convert your dlls back into code, search for that and use that