Dear Visual FoxPro users

I have made an executableand and put it in a directory with my database. In the beginning of my program I have done SET DEFAULT "c:\MyApp" and SET PATH c:\MyApp;a:\
but some how there is a connection between my database in my application and my database in the develping enviroment(c:\vfp\develop). How did I found out. Yesterday I managed to corrupt my database in the develping enviroment, but my database in my applcation is still working. When I ran my application I get an error message saying "The database in invalid...". How can my application know that my database is invalid in my develping enviroment? If I change the directory c:\vfp\develop to c:\vfp\develop_old, my application works just fine. I have done EDIT/FIND in my forms and I can't find any strange SET DEFAULT or SET PATH. Are there any more commands I should know about?