1288700 - Incorrect mimetype for excel spreadsheet selected via file input

Status: RESOLVED WORKSFORME

(Firefox :: File Handling, defect)

Description

[Joseph Vaughan]

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Build ID: 20160623154057

Steps to reproduce:

Using the following JSFiddle: https://jsfiddle.net/5Lsg18y5/7/

Select an excel spreadsheet file (xlsx) with the file input.


Actual results:

Reported mimetype is "application/vnd.openxmlformats-officedocument.spreadsheet.sheet"


Expected results:

Reported mimetype should be "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" 

Note the addition of "ml" in "spreadsheet". All other browsers report it correctly, including Firefox Developer Edition.

Comment 1

[Loic]

I got application/vnd.ms-excel.12 with FF47 on Win 7.

Comment 2

[Joseph Vaughan]

I am using Excel 2016 to save xlsx files, which are saved as the expected mime type. application/vnd.ms-excel seems to be for 97-2003 (xls) documents, which is what I get if I test with that document format.

https://www.sitepoint.com/web-foundations/mime-types-summary-list/

Comment 3

[Joseph Vaughan]

I can no longer replicate this. I wish I had an answer for you, but I have not changed the files, nor the code in the example I gave. 

I have rebooted my PC since, but I cannot explain why that would alter it... Perhaps it is something on Windows that was causing it.

Comment 4

[Loic]

Reopen the bug if the issue is back and you have better STR.