Hi Alex, I am now using the FileExtension property but was curious to know why the RegEx was failing, it turned out I needed to specify IgnoreCase in the c'tor of the RegEx, as my files for some reason are uppercase. (the /i is the standard for ignoring case in Perl, PHP etc.. Regexes - have MS done it again ? )

Regex rx = new Regex(".ogg", RegexOptions.IgnoreCase);

all is now well, thanks for your time