How can I start RH9 such that it behaves as being started without any MRU or remembering about its history?
I found that when I had a fresh project coming from RHX5 and started RH9 once on the .xpj file it noticed, that
it was from an older RH version and asked for conversion. I confirmed and let it convert. But after I deleted the directory tree in which that project was installed and copied it over again from a .tar file, started ´RH9 on the xpj file again, it behaved like having converted this project already to RH9.
Just use the Tools > Options menu item. In the dialog click on the Recent Projects group which displays all your recently opened projects. From there you can select a project and click "Remove" to delete it from the recently opened project list.