Very laborious use of the string builder. This would do it more easily.
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Writing the code to parse the date / time from the file name at 15 mins was a bit painful, much easier with
DateTime dateCreated = DateTime.ParseExact(file.Substring(0,16), "yyyy_MM_dd_HH_mm",System.Globalization.CultureInfo.InvariantCulture);
it is COLON not SEMI colon in the path. The video was just clear enough to see that although bob says semi colon it might be a colon and after an hour of messaging about thinking I had the terms in the path wrong, I tried /appname:folder/filename.xaml and it worked.