trouble opening Excel Docs in Sharepoint

We have a sharepoint user that is used to dragging excel documents to his site and later opening them and modifying them. His files have been getting larger. He recently noticed that files over 10 MB do not open and give him the humorous error I included in the attachment.  I sure there is a simple setting in Site Settings or somewhere on the page that I can modify to increase document sizes that can be opened. Would someone be kind enough to point me in the right direction.
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Jackie ManIT ManagerCommented:
There is nothing you can do unless you can change the setting.

It is the design of office web app and you need to download the file and use MS Excel client to edit the file.

The workbook size is controlled by a property ExcelWorkbookSizeMax, to get the current value of this property

Log onto the Office Web Apps 2013 Server > Open PowerShell and type


To change this value from 10 MB to lest say 50 MB, just execute the following in PowerShell

Set-OfficeWebAppsFarm -ExcelWorkbookSizeMax 50

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