C:\> echo on

C:\> assoc .pl=perltest
.pl=perltest

C:\> perl -e"system(qq(ftype perltest=$^X \"%1\" %*))"
perltest=C:\strawberry\perl\bin\perl.exe "%1" %*

C:\> ftype perltest
perltest=C:\strawberry\perl\bin\perl.exe "%1" %*

C:\> mkdir pipe

C:\> cd pipe

C:\pipe> pipe
'pipe' is not recognized as an internal or external command,
operable program or batch file.