C# 部署时WindowsAPICodePack属性为null

在本地调试时，我能够从.mp4视频中读取标题

但是，将此应用程序部署到IIS后，Title属性为null

知道为什么会这样吗

foreach (var f in new DirectoryInfo(videosLocation).GetFiles()
                            .Where(x => x.FullName.EndsWith(".mp4", StringComparison.CurrentCultureIgnoreCase))
                            .ToList())
        {
            using (var so = ShellObject.FromParsingName(f.FullName))
            {
                var titleProp = so.Properties.GetProperty(SystemProperties.System.Title).ValueAsObject;
                var title = titleProp == null ? "no title" : titleProp.ToString();
                // title is null when deployed
            }
        }

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请显示相关代码。谢谢@CodeCaster我已经添加了相关代码