OLEError.fileIsNotOLE

[meili19916]

Hello,i use CryptoOffice to analysis a xlsx and a pptx file,but it stoped at OLEFile(path) of the method "try Header(&stream, fileSize: fileSize, path: path)" and the inner method "guard stream.readData(ofLength: magic.count) == magic else { throw OLEError.fileIsNotOLE(path) }", how to solve the problem?
I can use CoreXLSX to get the same xlsx file. so what's wrong with the OLEKit?