Can appropriate version of Delphi be determined from project files or .exe?

Situation is that I have a "build" of a product that I know to have been written in Delphi.  It clearly is not happy in D7.  Is there a way to absolutely determine what version of Delphi the original authors were compiling the project in?

Side comment:  there are third party packages included which appear to be D6.  for example, PTShellControlPackD6.  I am curious if it would still be possible that the main project was built with D5 and was including D6 external packages.

Basically I am trying to figure out a way to not guess what version this code was built with.
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IFAIK packages must exactly match the Delphi version they are used in.

If the product uses the Borland runtime libraries, you can search for vcl or rtl in the executable, the next couple of ascii digits will be the Delphi version.

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