I wouldn't rule out an employer for this, but it's annoying.
I use Ubuntu at home. As someone who will need to work with Ubuntu Server at work, I think that's a good thing for my employability. Using Microsoft Word in Ubuntu is not an option for me.
So it's a Giant Pain in the Butt to produce a Word-formatted resume (no, OpenOfice and Google Docs don't make it reliably look good), and there's no reason they need that because they're not going to edit it.
On the other hand, it's easy for me to produce a PDF, which will look better anyway, and it can be done using the OS I will be using at the job I'm applying for.
Being told, effectively, "we require you to install Windows so that you can submit a nice-looking resume for this job working with Unix" is annoying. It's a small factor in how interested I am in the job, but a factor nonetheless, because it shows (to me) that technical people are not running the company.
I use Ubuntu at home. As someone who will need to work with Ubuntu Server at work, I think that's a good thing for my employability. Using Microsoft Word in Ubuntu is not an option for me.
So it's a Giant Pain in the Butt to produce a Word-formatted resume (no, OpenOfice and Google Docs don't make it reliably look good), and there's no reason they need that because they're not going to edit it.
On the other hand, it's easy for me to produce a PDF, which will look better anyway, and it can be done using the OS I will be using at the job I'm applying for.
Being told, effectively, "we require you to install Windows so that you can submit a nice-looking resume for this job working with Unix" is annoying. It's a small factor in how interested I am in the job, but a factor nonetheless, because it shows (to me) that technical people are not running the company.