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Gets or sets the URL prefix of attached files, such as images, in the HTML file.
public string AttachedFilesUrlPrefix { get; set; }
Public Property AttachedFilesUrlPrefix As String
HtmlSaveOptions options = new HtmlSaveOptions();
options.AttachedFilesUrlPrefix = "resources/";
string urlPrefix = options.AttachedFilesUrlPrefix;
using MemoryStream stream = new MemoryStream();
workbook.Save(stream, options);