Swift package to read compound file (Structured Storage File) content documented in MS-CFB
Add the following line to your project's SwiftPM dependencies:
.package(url: "https://github.com/hughbe/CompoundFileReader", from: "1.0.0"),
import CompoundFileReader
let data = Data(contentsOfFile: "<path-to-file>")!
let file = try CompoundFile(data: data)
print(file.rootStorage)