Editing a text file

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Newsgroups gmane.os.tru64.managers
Message-ID <E9A5BDEA51B25448AFD53DAA463B7199018FE885@bnns00003.emea.zf-world.com>
Hi managers,

in a very large text file we want to replace in one column every character by one fixed character.

Example:

    In column 37 we need "X" in every line.

How can I do this?

Mit freundlichem Gruß/Yours sincerely
Werner Rost
GMT-FIR - Netzwerk
 
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