With special thanks to Jim Giordano for finding it, a large repository of Ketil Olsen's projects is locate at SourceForge.
https://sourceforge.net/p/fbedit/code/HEAD/tree/
If you take a snapshot from that page you will get a 64 meg archive that contains a large number of projects that Ketil wrote including RadASM and ResEd. Note that this is not entry level software and it requires an advanced level of programming skills but it is well written professional software that will be useful to many people.
The code as posted at SourceForge is placed in the public domain so you are free to modify the examples. As a normal courtesy, if you make a fork from any of Ketil's code, its origin an original authorship should be credited.