Hi Phil,
I wanted to loop back on this as it's proving to be a bit more troublesome to get this working with the C# wrapper than I first thought. I was wondering if there was any option in ExifTool to override the default newline conversion; instead of converting to periods, convert to a character(s) that are specified in the option (thinking along the lines of the -sep option). This would allow me to specify an "unlikely" character, e.g. ~, that could be easily identified in the output string and converted back. Of course, that doesn't address saving multi-line text back to the metadata field, unless of course by specifying the same option while writing that you'd convert back to the proper newline character(s).
Thoughts?
Ken