lprun.exe is not an option when you need to start multiple instances of the same or different LINQPad scripts at about same time because of lprun.exe first cleans up "old" files in its temporary folder like %TMP%\LINQPad and finally it deletes (!??) this folder at all. So, some instances can not find their compiled dll's as they were deleted by another instance of lprun.exe. This is why I vote for an ability to generate exe files for my LINQPad scripts to do not compile on the fly.