[2005] Before I start a new project

I want to write a small utility to allows a user to convert a .txt file into a .csv file.
The .txt files are report files, with different columns, formats, etc. depending on which report the user opens.
I want the user to be able to select a .txt file, and put the contents onto a TextBox where they can view the report and allow them visually to pick out where the columns are, and a suitable row containing what will become a column header.
Ideally, I'd like the user to be able to identify the column breaks using something like the ruler in Word where the user can drag tabs around - but I think that this is probably a little ahead of myself at this stage, so I'll probably provide another single line TextBox where the user can type a few "X"'s or something to indicate where the columns are.
Any pointers before I start would be helpful.