Please send me UNDELETE command file?.?

I work with "Windows 98". I (dos based) FoxPro billing PROGRAM.

I double-click (ed) software billing and minimized. And now I go to MS-DOS and use the command "DIR, EDIT", etc,

unknowly I load the new "Billing Software" MS-DOS. You have an error as follows:;

BILL.DBF file is missing. I searched all Computer