Excel Export Warning

QuestionsExcel Export Warning
Susan Watt asked 10 years ago

Is there any way to prevent the excel exports from getting the warning "The file you are trying to open 'report_grid.xls' is in a different format than specified by the file extension"

2 Answers
Abu Ghufran answered 10 years ago

It's a common issue with new version of ms excel, but i am unable to generate this issue.
http://forums.asp.net/t/1221467.aspx?Export+GridView+to+Excel+xlsx+Excel+2007+Format+

After some research, i found this lib which (by comments) is capable to remove this warning.
http://phpexcel.codeplex.com/wikipage?title=Examples&referringTitle=Home

Can you please check it's demos, if it is working fine or not. After that, i can incorporate it in grid code lib.

Mike Sheppard answered 8 years ago

This can be solved with a registry edit (or a group policy).

Change the version to your Excel Version appropriately (Office 2003 = 11.0, Office 2007 = 12.0, Office 2010 = 14.0 and Office 2013 = 15.0).

[HKEY_CURRENT_USERSoftwareMicrosoftOffice<version#>ExcelSecurity]
"ExtensionHardening"=dword:00000000

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