Invalid Mimetype Detection for .xls file with CF10

Question

After upgrading to CF10, we are having issues getting our server to properly recognize any mimetype associated with the .xls file extension.  For some odd reason, the server is viewing them as a word file type and rejecting it.   
When we upload a file with the .xls extension, the server responds back with the following error message:
"The MIME type or the Extension of the uploaded file application/msword was not accepted by the server. Only files of type application/excel,application/vnd.ms-excel,application/x-excel,application/x-msexcel,appl ication/vnd.openxmlformats-officedocument.spreadsheetml.sheet can be uploaded. Verify that you are uploading a file of the appropriate type. The error type is Application."
Our only workaround for the time being is uploading all files in the newer .xlsx format, which the server properly accepts.  As you will see from the above error message, those are the mimetypes I have thus far.  The other work around is updating the tika jar files which I have included more details in my bug report link below, but that is a solution we are steering off of until we get further confirmation on the solution. 
I've reported this possible bug to Adobe, but of course it will be weeks or months before a confirmation or response is made on it since there are countless other bugs / feature requests that are still unanswered.  So I'm reaching out to the community in efforts to see if anyone else may have received the same issue or could see what we may be doing wrong. 
Link to bug report with more details: https://bugbase.adobe.com/index.cfm?event=bug&id=3343364

Answer 1

If you guys want to replicate this in your local environment, it's very easy using the steps I outlined in my bug report.  Please report back on your results.  I would love to see if other users experience the same or different.
Steps to Reproduce:
1. Create cfset tags to specify what type of files and mime types are allowed for user uploads.
<cfset uploadFileFilter = ".xls,.xlsx" />
<cfset uploadFileMimeType = "application/excel,application/vnd.ms-excel,application/x-excel,application/x-msexcel,app lication/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
2. Define where the file will be uploaded to using the cffile attribute. (Change destination to the same directory of where you are creating the current .cfm file below)
<cffile action = "upload"
fileField = "fileupload"
destination = "C:\test\"
accept = "#uploadFileMimeType#"
nameConflict = "MakeUnique">
3. Finally create a simple form that allows the user to upload files.
<cfform enctype="multipart/form-data">
<cfinput accept="#uploadFileMimeType#" type="file" name="FileContents">
<br/>
<cfinput type="submit" name="submit" value="Upload File">
</cfform>
4. Open excel, enter any data, and save it as an .xls file.
5. Submit it to the form.
Final code
<cfset uploadFileFilter = ".xls,.xlsx" />
<cfset uploadFileMimeType = "application/excel,application/vnd.ms-excel,application/x-excel,application/x-msexcel,app lication/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
<cfif isDefined("Form.FileContents") >
    <cffile action = "upload" 
        fileField = "FileContents" 
        destination = "C:\EnterLocalPathHere\" 
        accept = "#uploadFileMimeType#" 
        nameConflict = "MakeUnique">
<cfelse>
    <cfform enctype="multipart/form-data">
        <cfinput accept="#uploadFileMimeType#" type="file" name="FileContents">
        <br/>
        <cfinput type="submit" name="submit" value="Upload File"> 
    </cfform>
</cfif>