>>>>Also, what happens if I installed SP2 over SP1?
>>>
>>>It will not work
>>
>>Not entirely true. It'll work if xBase components of VFP9 SP1 hasn't been modified. Any modified components will not be updated to SP2.
>
>Now I'm puzzled. What does "xBase components of VFP9 SP1 hasn't been modified" mean. What component. Just out of curiosity - it wasn't that hard to reinstall.

The "xBase components" are VFP components that are written in VFP, like FFC, Wizards, etc. When SP2 is installed it compares modification date of a component with modification date in SP2. If component has been modified its modification date will be newer than SP2 and it'l not be updated.