public void RenameFile(string oldFilename, string newFilename)
{
string newPathname = Path.GetFullPath(newFilename);
RenameFile(Path.GetFullPath(oldFilename), newPathname, RecentFileHelper.ShortenPathname(newPathname, MaxShortenPathLength));
}
public void AddFile(string filename)
{
string pathname = Path.GetFullPath(filename);
AddFile(pathname, RecentFileHelper.ShortenPathname(pathname, MaxShortenPathLength));
}