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.