Excel reading error

```
Debugger listening on [::]:62770
(node:22204) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 8): Error: Non-whitespace before first tag.
Line: 0
Column: 1
Char: 
```
So , what i found - with regular excel files all works fine - but with files transferred via internet (skype/email etc.) i got this error - after some investigation i found that such files are blocked because they are from internet and could be not safe (when open such file in excel it is blocked on editing - and there is a button in excel - allow editing , or it could be found in file properties (main file property window below read-only and hidden checkbox there is a warning with additional unblock check box))

So after unblocking this file (in any way from excel button or in file prorepties and !!!resaving!!! it , file reads fine.
Can we handle it automatically ,e.g. adding in read options additional flag for accept reading not-safe files?

The issue names no source files, tests, or entry points. Start by reproducing the reported error with a blocked internet-transferred Excel file and compare it with an unblocked, resaved file; done means the library can read the blocked file through the requested option without breaking regular Excel reads.

Written by the indexing model from the issue text.