Mimetype of docx changes when content is added

[pwfraley]

This issue is unique.

• [X] I have used the search tool and did not find an issue describing my bug.

Operating System

Linux (RPM package)

Version information

7.4.0.163

Expected Behavior

I expect the Mimetype to stay the same, whether the document is empty or it contains text

Actual Behavior

Empty Documents are saved with the Mimetype: Dokument1.docx: Microsoft Word 2007+ Dokument1.docx: application/vnd.openxmlformats-officedocument.wordprocessingml.document

Documents containing text are saved with the following mimetype: Dokument1.docx: Zip archive data, at least v2.0 to extract, compression method=store Dokument1.docx: application/zip

Reproduction Steps

1. Start OnlyOffice
2. Create Empty Document
3. Save Empty Document4. Close OnlyOffice
4. Open Terminal file Document1.docx
5. Dokument1.docx: Microsoft Word 2007+ file --mime-type Document1.docx
6. Dokument1.docx: application/vnd.openxmlformats-officedocument.wordprocessingml.document
7. Open the previous Document with OnlyOffice
8. Type in some Text (Hello World!)
9. Save Document
10. close OnlyOffice
11. file Document1.docx Dokument1.docx: Zip archive data, at least v2.0 to extract, compression method=store
12. file --mime-type Document1.docx Dokument1.docx: application/zip

Additional information

OS: Fedora 38 Versions Tested: RPM and Flatpak 7.4.0.163 (rpm or flatpak)

[pwfraley]

This also happens with the onlyoffice document server docker image, with Nextcloud. The Mimetype there is also changed when content is added to the document.

[XDmitryK]

@pwfraley Hi I can confirm - this is bug, issue 63355 in our internal issue tracker. Thank you for report.