http://www.azslow.com/index.php/topic,297.0.html Without it, you will have 3 problems:
1) if you was using Sonar before 2017.1, your ACT mapping files are probably corrupted (Sonar will not tell you that, but it will not cure it)
2) some plug-ins (especially Sonar build-in) will be hard to learn
3) after a while, you will loose ALL your mappings...
With this utility: you can make backups (with a check they are ok) in one click (just do not do this while Sonar is running) and clear/reset wrong mappings.