Windows requires double quotes and does not allow the backslash.

>perl -le "\$, = q( ); print q(a)..q(z)"
Experimental aliasing via reference not enabled at -e line 1.

>perl -le "$, = q( ); print q(a)..q(z)"
a b c d e f g h i j k l m n o p q r s t u v w x y z

>perl -le '$, = q( ); print q(a)..q(z)'
Can't find string terminator "'" anywhere before EOF at -e line 1.

>perl -le '\$, = q( ); print q(a)..q(z)'
Can't find string terminator "'" anywhere before EOF at -e line 1.
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