Sometimes you have a Delphi project and don't know which Delphi version you should use to build it. Here are some hints to find out (based on this [1] Stack Overflow question and the answers): * If there is a .dproj file, it's a Delphi version >= 2007. * If there is a .bdsproj file, it's Delphi 2005 or 2006. * If there is none of the above, there should be a .dof file. If there is, it's Delphi <=7. * If there is not even a .dof file, you are stuck, sorry. By analyzing these files, we can find out more: