Problem in opening directly xlsx files from firefox

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Hi I have an web application project. for some clients there is a problem with opening xlsx attachments directly from firefox without saving.
When they open the attachment the format is damaged.
But when they save the attachment and then open it, there is no problem.
Dose anyone know what the problem can be?

What I have tried:

Firefox application options and other settings.
remove old versions of Microsoft office .

Posted 5-Mar-16 1:24am

Sara NA

Updated 29-Aug-19 6:06am

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Comments

Patrice T 5-Mar-16 14:43pm

Explain where the attachment come from, and how you open it.

Sara NA 6-Mar-16 0:30am

all of the attachments are saved as filestream in sql.
other types of the extensions have no problem.
to show them, i use hypelink and then i use a ashx page to show the attachment by the code bellow :

FileByte = Dt.Rows(0).Item("FileData")
context.Response.ContentType = cCommonMethod.GetOfficeFileExtention(Extension)
context.Response.BinaryWrite(FileByte)

Patrice T 6-Mar-16 5:50am

Excel write in its files when open.
if file does not exist it may be your problem.

Sara NA 8-Mar-16 3:24am

what is your mean?

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Member 12874995 · Answer 1 · 2019-08-29T06:06:00

Solution 1

Pls add
Response.ContentType = "application/vnd.xls";

Posted 29-Aug-19 6:06am

Member 12874995

Comments

Dave Kreskowiak 29-Aug-19 12:23pm

That's not a valid content type. The Excel content types are
"application.vnd.ms-excel" and "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"