Since yesterday, I wasn't able to open Excel files located on the network which were previously running just fine.
I was receiving errors saying that the file was corrupted or the Excel splash screen was simply freezing trying to open the file.
To add to this strange issue, the same file when copied on my desktop was opening just fine!
I haven't changed anything on my computer. I even tried a Office 2016 repair. So surely one of the Windows Update pushed automatically to my Windows 10!
I have been able to fix my issue by following the steps listed on https://forum.openoffice.org/en/forum/viewtopic.php?f=15&t=42387 (even if I don't have Open Office installed!).