>>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.

>Yes, but you have to consider a lot:

So basically as long as I keep the code compatible with 5.0, and keep the library compiled in 5.0 I can use it in 5.0 and 6.0?

I was affraid that even opening the library in 6.0 Class Browser would update it to 6.0 format and make it not usable with 5.0.