How to pull data from multiple files and place each data on its own row?

Hi guys, I hope you can help me with my code. What I need is ability to pull data from multiple files, either one by one or all at the same time and place it in target file, witch each data going on its own row.

My source file is

Info	Data
Info	Data
Info	Data

My Target files is:

Row 1	data	data	data	data
Row 2	data	data	data	data
Row 3	data	data	data	data

So what I need is when I open a file, it checks, ok there is data already on first row, place the next string of data on the row below. I wrote up the code, but it doesn't seem to work, it just simply keeps over writing the initial row (in my target file the data row stars from 3rd row) and doesn't place anything on the row below. Any help would be greatly appriciated. Here is the code:

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Can anyone help? Really desperate to find a solution to this...