>I have FoxPro 6.0 program1 that has a button to run another FoxPro program2. But everytime after run program2 and go back program1. when click other button in program1. It always says that "File programName.prg does not exist".
>
>Could anybody help me with this bug?

Check the Set Path, Set Default (aka CD) statements in both programs. Somehow you're losing either the current directory or the VFP internal path. You can set watch points on both Set("path") and set("default") in the debugger, and see when they change.