Hi,
Which version of MyEclipse are you working with? You can install Drools (minus the JBoss Drools Runtime Detector) to latest MyEclipse 2021.
I installed it using this update site : https://download.jboss.org/drools/release/7.48.0.Final/org.drools.updatesite
and I could create a Drools project successfully and the *.drl files open with Rule Editor. Please give it a try.
Do let us know if you see any issues with it.
–Swapna
Genuitec Support