Remote access unable to open Excel files

Can anyone help with this problem.

I am unable to open MS Excel files by remote access. I get the message that I don’t have a reader installed.

MS Word and other MS Office files open without a problem.

I am using a Samsung Tab 3 & Samsung Galaxy S3.

The installed software on both is Polaris & Mobisystems Office Suite 7, both open Excel docs installed on the SD card.

Any advice would be appreciated.

Thank you…

What happens if you DOWNLOAD the file using the app, and then try to open the downloaded file?