Below is a video which answers your query.
What is shared in this video only applies to both Topic and Study Notes used in old versions of e-Sword prior to version 9 and above. This would include Topic Note resources by JL Dagg, and John Gill resources.
That said, when it comes to Commentary (cmt) resources by Dagg and/or Gill, you will need to have the converter for them.
Trust you will find this helpful.
I did find it helpful, brother, but all my old topic files are either in .exe or .top formats, which are not covered in your video.