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Another instance that can occur when downloading a file from the internet is that Excel can "block" the spreadsheet from opening. If this happens, Excel may throw the following error message upon opening the spreadsheet: Microsoft Excel cannot open or save any more documents because there is not enough memory or disk space available. While this error may mean that there is an issue with memory/disk space on that computer, it can also mean that Excel has blocked your file. To unblock a file, use the following instructions: