updating and saving .dat files

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I have a .dat file created by a different software package which I would like to amend slightly in matlab and resave. I have done this using the fopen and fprintf commands. However, when I use the new .dat file, the software package doesn't recognise it (even though when I open it up in notepad it looks fine). If I open the .dat file in notepad and manually make changes and save it (using ANSI encoding), it's fine.

I have tried using the windows-1252 encoding (which I believe is the code page for ANSI on my system) with the fopen (and subsequent fprintf) commands but this doesn't seem to work.

Any help would be appreciated.