Windows screws up mime type for Documents

Currently it is not possible to upload .tex or .zip files from windows machines. The error is "Not allowed" and most likely generated here: https://gitlab.ethz.ch/vseth/sip-com-apps/community-solutions/-/blob/master/backend/documents/views.py#L121. I suspect the problem is here with detecting the different file types: https://gitlab.ethz.ch/vseth/sip-com-apps/community-solutions/-/blob/master/frontend/src/pages/document-page.tsx#L43.