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Wow im happy to see you can understand what im posted...
The solution you give to me works fine, but in my project i have to use full path referencing to files because we have repeatedly filenames in various folders, so if you know any other possibility to do this...
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So in other words, are you saying that you have two class libraries of the same name that are in two different paths that you will need to set? Hmmm.... well, this second suggestion is not very elegant, but I suppose that you could have two "SET CLASSLIB" settings, one for when it's an EXE and one for when it is a PRG.

IF IsEXE()
   SET CLASSLIB TO MyClass, YourClass, HerClass
ELSE
   SET CLASSLIB TO F:\TheDir\MyClass, Q:\ThatDir\YourClass, X:\TheDur\HerClass
ENDIF

[BTW, the IsEXE() function could use any number of approaches to figuring out if the currently running file is an EXE. There are several approaches. Personally, I tend to have an optional parameter in my MAIN program anyway ("Do Main With .T." means "program/debug mode"). In that case, IsEXE would simply "RETURN NOT tlDebugMode". Not sure if you already have your own approach in place for this.]