different target dirs

I want two different target dirs. One is INSTDIR, and another is got from the regedit. How can I do ? How to use the SetOutPath for the other dir?

Thanks.

I use StrCpy to set the dir. But another question is:
StrCpy R1 "c:\" is right, and
StrCpy R "c:\" is error, and
StrCpy T1 "c:\" is error , why?

The StrCpy has some limited?

The first parameter is the variable. You can declare a variable with the Var command.