bootable OpenBSD USB stick from windows?

[Heptas Torres]

Hello
I have an old laptop with no CD-ROM but can boot from USB. Given that
I only have access to a windows machine to burn an iso image, do you
know of an easy way (e.g. some windows programa) to create a bootable
OpenBSD USB stick which I can then use to install OpenBSD on my old
laptop?
-heptas