Sub MakeFile()
Open "c:\longfile.txt" For Output As #1
For c = 1 To 300
Write #1, "Field" & Format(c, "000");
Next c
Print #1,
For r = 1 To 100
For c = 1 To 300
If c <> 300 Then
Write #1, Int(Rnd * 1000);
Else
Write #1, Int(Rnd * 1000)
End If
Next c
Next r
Close
End Sub