A: This is simply asking 
too much. You cannot decompile a TP
program in a manner that would give you back the original source.
This method of reverse engineering is not on in actual practice.
Quoting Jeroen Pluimers (jeroenp@dragons.nest.nl) "During 
the
compilation, important information get's lost about variables,
types, identifiers etc. Writing a Pascal Decompiler is impossible.
The best you can achieve is a disassembler that can help you
recognize some Pascal statements."
   You might note that this question somewhat resembles another
frequent question "How can I convert a TPU unit of one TP 
version to
another?" which cannot be solved without the original source 
code.