If it's not just the way the text editor displays the data, maybe the lines are
too long.

A .prn file will wrap when the line length goes over 240 characters.

Artist999 wrote:

data was entered in Excel and saved as a prn file and then
changes were made and file was saved. Using Windows
explorer, I renamed the file as .txt. When the file is opened
by my customer they see that the file looks like it is wrapped
around to the next line. They can't use this and I can't fix it.
Any ideas? Thanks

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Dave Peterson