You don't say how you're generating a Word document from the text output from your Perl program. If, however, you're just making a text document and then reading it into Word, you're going to have some problems using Word's multicolumnar mode.

Although you could probably use formats to make a double-column output in a text file, if you read it into Word it wouldn't look very good unless it was in a monospaced font. And the pagination would not flow properly, since Word wouldn't know that it was supposed to be multiple columns.

A better solution may be to make a single-column text file, and read it into a Word template that is set up to be multiple columns.