Open a xlsx file with Coldfusion 10

Good morning everybody,

I have a page containing a list of files (Excel in different format such as xls, xlsx and xlsm).

To open it, I use different content type: (see code below)

For the extension xls and xlsm, it work fine.

for xlsx, I receive the following error:

     "Excel cannot open the file 'xxx.xlsx' because the file format or file extension is not valid."

I already search on internet https://forums.adobe.com/message/8911025#8911025 and tried without effect.

I can open if I use the "cfcontent type='application/msexcel' " but I loose everything about Excel 2010.

There is anyone which can help me?

Thank you in advance for your support

Best regards

André

the code:

<cfset FileName  = Replace(request.getXlsFile.Uploaded_File_Name, ' ', '_',"All") >

<cfset extension = request.getXlsFile.template_ext >

<cfoutput>   

    <cfheader name="Cache-Control" value="private">

    <cfheader name="Content-Disposition" value="attachment; filename=#FileName#" >

    <cfswitch expression="#extension#" >

        <!--- Excel format --->

        <cfcase value="xls">

            <cfcontent type="application/msexcel" reset="Yes" variable="#request.getXlsFile.Uploaded_XLS_File#">       

        </cfcase>

        <cfcase value="xlsx" >

            <cfcontent type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" reset="Yes" variable="#request.getXlsFile.Uploaded_XLS_File#">       

        </cfcase>          

        <cfcase value="xlsm" >

            <cfcontent type="application/vnd.ms-excel.sheet.macroEnabled.12" reset="Yes" variable="#request.getXlsFile.Uploaded_XLS_File#">       

        </cfcase>

        <cfdefaultcase>

            <cfcontent type="application/msexcel" reset="Yes" variable="#request.getXlsFile.Uploaded_XLS_File#">

        </cfdefaultcase>

    </cfswitch>

</cfoutput>

<cfabort>