>>>Make sure to add QUIT as the last line in your main program.
>>
>>Why doesn't the MODI FILE work?
>
>What are the non-default properties of your form? Is the _Screen visible when you run your application?

No it's not. I didn't want the VFP windo to be visible. I modified my code thus:

LOCAL lcPath, llOldScreenVisible 

lcPath = ADDBS(justpath(FULLPATH(thisform.FileName)))

llOldScreenVisible = _screen.visible  &&In EXE it is not visible
_screen.Visible = .t.
MODIFY FILE (lcPath + 'SKUDUPES.TXT')  NOEDIT
_screen.Visible = llOldScreenVisible 

Ths only thing is I can't get it to be the same size as the screen. None of the following work:

MODIFY FILE cat window screen
MODIFY FILE cat window _screen
MODIFY FILE cat window '_screen'
MODIFY FILE cat window 'screen'
MODIFY FILE cat window &screen
MODIFY FILE cat window &_screen
MODIFY FILE cat WINDOW 'Microsoft Visual FoxPro'
MODIFY FILE cat WINDOW "Microsoft Visual FoxPro"