Why is Excel warning me when opening a xlsx file? ("Warning, files from the internet can have viruses")
I thought that xlsx files cannot contain macros?
This is a general warning that Windows issues on the opening of any file of any type
that was downloaded from the internet. It has no connection to the fact that the
file is of type .xslx
.
This is because security breaches have been found for almost all file types.
Even if no such is currently known for .xslx
files (or other),
this doesn't mean that one won't be discovered tomorrow.
Security is always one step behind the hackers.
Could also be because the file contains hyperlinks... that is if the warning comes direct from Excel and not Windows.
If you want to be super cautious, open the file first in google docs.