which perldoc.bat
C:\EX_D\ulisseDUE\perl5.20.64bit\perl\bin\perldoc.bat

 which --all perldoc.bat
C:\EX_D\ulisseDUE\perl5.20.64bit\perl\bin\perldoc.bat
C:\EX_D\ulisseDUE\perl5.26.64bit\perl\bin\perldoc.bat

 where perldoc.bat
C:\EX_D\ulisseDUE\perl5.20.64bit\perl\bin\perldoc.bat
C:\EX_D\ulisseDUE\perl5.26.64bit\perl\bin\perldoc.bat