Detect File Format of Encrypted Office Open XML - OOXML Files

Office Open XML (also known as OOXML or Microsoft Open XML (MOX)) is an XML-based file format developed by Microsoft for representing office documents like spreadsheets, charts, presentations, and word processing documents.

Aspose.Cells provides a way to detect the file format of encrypted Microsoft Open XML files. To identify the file type, use the FileFormatUtil.DetectFileFormat method as shown below in the code example.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
//Source directory
string sourceDir = RunExamples.Get_SourceDirectory();
            
var filename = sourceDir + "encryptedBook1.out.tmp";

 Stream stream = File.Open(filename, FileMode.Open);

FileFormatInfo fileFormatInfo = FileFormatUtil.DetectFileFormat(stream, "1234"); // The password is 1234

Console.WriteLine("File Format: " + fileFormatInfo.FileFormatType);