Hurray, its finally fixed! manage code 'just works' from network file share! Now I know that some of you are probably just saying 'who cares' or 'huh?' but for those of us who have hit this problem, this has been a major deployment headache, and I am happy to say that the end of this particular problem is in sight. The problem scenario is this. If you have a managed applications like 'MyApp.exe' it works great if you run it locally (eg C:\bin\MyApp.exe), but fails when you try to run it from a network location (eg \\Myhost\bin\MyApp.exe). The problem is that the security system for the runtime treats network locations as less trustworthy than local locations, and thus throws an security exception. The problem is that failing to run managed code WHILE STILL ALLOWING UNMANAGED EXE's to run, does not provide any security (because hackers will simply use unmanaged code) but does cause nontrivial deployment headaches (manage apps can't be run from network locations).