To nevím, nejsem programátor. Proto taky ten otazník 
http://www.ghisler.ch/wiki/index.php/Total_Command er_for_Windows_XP_64-bit
Tak jsem si to pamatoval dobře, text je ale 3 roky starý.Currently a 64-bit version of Total Commander is not available.
That is because Borland has not yet published a Delphi 64-bit version nor is a 64-bit compiler available. That were a pre-condition because Total Commander is programmed in Delphi.