Mismatched MIME type detected for password protected docx, pttx, xlsx

[EranOfer]

Attach the file for which the detection is inaccurate

protected_xlsx.xlsx

protected_docx.docx

Expected MIME type

xlsx , docx, pptx

Returned MIME type

application/vnd.ms-powerpoint
.ppt

Version of the library you are using

github.com/gabriel-vasile/mimetype v1.4.3

Output of go version

go version go1.20.6 darwin/amd64

Additional context

I notice there is a problem with detecting lock xlsx , docx, pptx they are detected as ppt

[gabriel-vasile]

@EranOfer, I'm checking this.

One thing about the attached test files: the extensions are .docx and .xlsx, but those are actually .doc and .xls files.

[tamir-laminar]

@gabriel-vasile When the content of docx, xlsx, pptx is been protected, the content is been encrypted, and the file is no longer a valid zip file (yes, it looks like a .doc but it is still a .docx if you decrypt it)

Still, if we use the ubuntu file command we'll get the following:

~❯ file --mime-type /protected_docx.docx
/protected_docx.docx: application/encrypted

Also, for another docx file I have, that is encrypted using a MIP label, we'll get:

~❯ file --mime-type /Document.docx
/Document.docx: application/vnd.ms-office

But as he said, this library return application/vnd.ms-powerpoint which is not the case.