Error message: Unable to open Excel file - it may be password protected.

Hello

I recently get the error message "Unable to open Excel file - it may be password protected." if I try to open an Excel file in Studio 2014. The file is clearly not password protected. If I split the file into smaller bits (like 50 lines each), I am able to translate the text. 

Does anybody know a better solution for this problem instead of splitting the file which is not a very efficient way to work?

Thank you in advance for your support.

Kind regards,

Sabine