All files from previous versions of LibreOffice Writer will fail to open in 25.8.4 I try to recover at the prompt, but system cannot. I've tried files from older versions and same results. Impossible to open any writer file OTT and ODT. Regressed to 25.2.5 and all is OK. Seems to be 25.8.4 specific.
Thanks for reporting this issue, it looks like a duplicated of bug 167956 Could you please try with a daily build from https://dev-builds.libreoffice.org/daily/libreoffice-25-8/Win-x86_64@tb73-TDF/current/ and see if the issue is gone ? *** This bug has been marked as a duplicate of bug 167956 ***