Make a patch of the complete files modified by commits

I don't know how to call this post. I have a problem with patch (I'm too bad to get it t work properly) so I want to export a list of the files I have modified between two subversion commits. This is how I do it for now (I'm sure it's extremely perfectible).
svn co http://mysvnproject/trunk/project@1
This gets me the first version
svn update > diff-files.txt
This updates my copy to the latest version, but most importantly, it generates a list of files that have been updated or added.