Excel error090200_01.xml

[ADRS_MX]

Hello; I have a problem opening some different excel files (it has a lot of work and information using pivot tables). 

What things I have to avoid to do?

[#2]

Hello,

are the excel workbooks downloaded from the internet? Or you've been able to open the workbooks before and unable to open again?

Kindly let me know whichever applies