Can I find the Source code of my fikemaker program?
FileMaker is a proprietary software and they do not provide the uncompiled code. They only sell a compiled version of their software. This is just like buying Microsoft Word or Excel. You don't get the Source Code of those either.
Some people make consider the DDR report that you can get with FileMaker Pro Advanced a kind of code in that it lists all of the layouts, scripts, security, etc. Maybe that is what you are thinking about? It is in XML or HTML format.
Here is a sample DDR report in case it interests you. It was made from the FileMaker Contacts template that they freely give away.
Retrieving data ...