Thank you for reaching to us. Unfortunately, we currently do not support Protel99. I will add this to our features board on tools to support. We will let you know as soon as this feature has been supported.
On the other hand, importing to Protel 99 SE is possible if it supports P-CAD (which is available on our website) as an import format. It looks like to get P-CAD files into Protel they need to be in ASCII format and then Protel will import them.
Please let us know how it goes on your end and don't hesitate to reach out if you have any questions!
Answered 3 weeks, 2 days ago.