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chomp(@exeDllLines);
my @dllarray = grep { /\.(?:dll|exe)$/i } @exeDllLines;

chomp(@exeDllLines);

...
foreach (@exeDllLines) {
   push @dllarray, $_ if /\.(?:dll|exe)$/i;
}

chomp(@exeDllLines);
my @dllarray;
push @dllarray,               grep { /\.exe$/i } @exeDllLines;
push @dllarray, map { "[$_]"} grep { /\.dll$/i } @exeDllLines;

chomp(@exeDllLines);

...
   /\.dll$/ && do { push @dllarray, "[$_]";  next; };
   /\.exe$/ && do { push @dllarray,   $_  ;  next; };
}