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While renaming a sheet or chart, you entered an...
Dialog may appear differently depending on Windows style options and where it occurs.
While renaming a sheet or chart, you entered an invalid name. Try one of the following:
Make sure the name you entered does not exceed 31 characters. Make sure the name does not contain any of the following characters: : \ / ? * [ or ] Make sure you did not leave the name blank.
Your Microsoft Excel workbook may have an invalid character in the file name. It is recommended you click Cancel on this dialog, click File | Save, and then save the workbook with a file name that only consists of alphanumeric characters (a-z and 0-9). Excel workbook file names cannot include characters with mathematical formula or wildcard characters. For example, inclusion of a square bracket will corrupt the worksheet names used in the workbook. It is possible for Internet Explorer to include invalid characters automatically in some cases when the file is downloaded from a Web site. To avoid this error, do not add invalid characters to the name of workbooks or worksheets in Excel. It is also recommended to not use double quotes, parenthesis, or other characters as part of a file name or worksheet name. These characters may be considered "string delimiters" or special operators for the language your system is configured to use. This is especially true if you are using any Visual Basic for Applications (
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