How to change cell value in excel by reading data form a file using vb

I need to create a programme that will read data from a file and use that data to change cells in excel.

I am trying to create something that will allow me to change excel cell data live by dragging a mouse up and down, using puredata and visual basic.

For the visual basic I need it to read data from a file of some sort (havent worked out what type of file yet) on a loop and input that data into a specific cell in excel, so that when i drag the mouse, puredata changes the value in the file and vb reads this and inputs the data into excel so that the cells and my graph changes as a result.

If anyone can help thank you very much!

All the best
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