No, it can't in compressed format. But with some hacker tools, you can have acces to the decompressed EXE in memory. Victor Andersen have a lot of info about this issue. Then is easy to decompile.
UnFoxAll can decompile a Foxpro app even when is Refox Level II branded if has the runtime DLLs

>I think buy some of them. Refox scared me. Is refox can be open those?