public override IEnumerable <Item> Perform(IEnumerable <Item> items, IEnumerable <Item> modItems)
{
string path = GetPath(items.First());
if (!path.StartsWith(Dropbox.BasePath))
{
path = GetLink(path);
}
string url = Dropbox.GetRevisionsUrl(path);
Services.Environment.OpenUrl(url);
yield break;
}
