Hi,
Don't know much about VB 3.0 but in VB 6.0 there is a PictureBox mousedown event which gives you the xy coordinates e.g.
Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Open "file path" For Append As #1
Print #1, X, Y
Close #1
End Sub
Also, you could ask your question in the Visual Basic 3 & 4 forum
Jon