InfoPath Dev

Can some one explain how an Infopath file .xsf and  xsn related? ,

I have my form options Full Trust , and a certificate to run a code which writes files to x drive. Every time i change C# code in Infopath , i need to include my certificate in form options and i found out , you have to do save file or save as, once you save file, some of my coding was getting wiped out.

so if some one can explain xsf and xsn how they are integrated.. would be good thanks -

 A .xsn is an InfoPath template with all of its files packed up - you can rename to .cab and expand if you want. If you do that, or if you save your form as source files, you'll see that one of the files that makes up your .xsn file is an .xsf file.

However, I don't understand what you have going on that your code is not saving correctly - I think that is what you are saying?