Libraries are NOT compatible between 5.0 and 6.0 - you need to keep a separate set of libraries for each!

>You will definitely not want to take advantage of things like Access/Assign Methods or the HyperLink Class. Although you cannot take anything for granted, I would suggest compiling a class in 6.0, and attempting to instance those classes in 5.0. Things should work fine for you..
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>>Can you have one class lib that is used in VFP5 and VFP6? I have recently upgraded to VFP6 and I want to begin using my custom lib in it, but I must also keep it compatible with VFP5 development for a while longer. I cannot risk incompatibility with VFP5.