>well, i am starting the guessing game now, but if i understand you right your root .exe is calling other (secondary) .exe's. if this is the case, i don't think that the secondary .exe knows what the root .exe did in matters of 'set classlib...'. therefor the seconday .exe has to search for the .vcx in all the different path's.

Ok, that makes sense. So, first, it's still a mystery as to know why this is working on our production server where no VCX are stored anywhere. Secondly, how would I go to be safer in order to have those secondary EXE to see the classlib definitions which are loaded in the root?