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				@@ -492,7 +492,7 @@ namespace Masuit.Tools.Mime 
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				             new MimeMappingItem{Extension = "xht", MimeType = "application/xhtml+xml"}, 
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				             new MimeMappingItem{Extension = "xhtml", MimeType = "application/xhtml+xml"}, 
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				             new MimeMappingItem{Extension = "xls", MimeType = "application/vnd.ms-excel"}, 
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				-            new MimeMappingItem{Extension = "xlsx", MimeType = "application/vnd.ms-excel"}, 
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				+            new MimeMappingItem{Extension = "xlsx", MimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}, 
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				             new MimeMappingItem{Extension = "xpm", MimeType = "image/x-xpixmap"}, 
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				             new MimeMappingItem{Extension = "xslt", MimeType = "application/xslt+xml"}, 
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				             new MimeMappingItem{Extension = "xwd", MimeType = "image/x-xwindowdump"}, 
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