path c:\perl32\bin\; ...
ppm

##</code><code>##

path c:\perl64\bin\; ...
ppm

##</code><code>##

C:\test>assoc .pl
.pl=Perl

C:\test>ftype perl
perl=c:\perl32\bin\perl.exe "%1" %*

C:\test>assoc .pl64
.pl64=Perl64

C:\test>ftype perl64
perl=c:\perl64\bin\perl64.exe "%1" %*

C:\test>set pathext
PATHEXT=.pl;.pl64;.COM;.EXE;.BAT;.CMD;