I disagree about ClamAV in-so-far as its vanilla virus signature database. You really should use some third party ones though you have to be careful since some like specifically malware patrol are way too general. For example, malware patrol will identify any document mentioning any drive.google.com URL a virus.
In regards to MP, I actually submitted the offending signature to MP support and the CSR told said and I quote “Unfortunately that is not a false positive, there is confirmed malware hosted at drive.google.com.” It caught my attention because a bunch of READMEs from some github projects and some HTML files ended up in the quarantine. I asked if future signatures would include this general URL since I’m going to blacklist this specific signature and was told basically ‘yes, probably’.
I do recommend third parties though and most are free for personal use. Some require a key and therefore some sort of sign up but it isn’t terrible except perhaps in regards to where I’m posting, some would consider it so.
For Windows you can use KDE Connect (and also MacOS) or Microsoft Phone.
For Linux Mint there’s KDE Connect or GSConnect (GNOME Extension) though I don’t use GNOME often, I remember liking KDE Connect better still.
LibreOffice is compatible with Microsoft’s OOXML spec. They sold every suite on it in the nearly 20 years ago to stop fines from the EU. They sold competing suites on it instead of using anything else available.
Microsoft however never actually fully supported their own spec and will save as “OOXML Transition” or whatever they call it now because they’ve been in ‘transition’ for nearly 20 years but still have proprietary blobs inside of it. You can however make MS Office save in OOXML Strict which is supposed to be compliant to the now ISO spec that LibreOffice actually supports.
This isn’t LibreOffice’s fault.
Because money.