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When downloading Excel file .xlsx extension name is not added

  • 5 replies
  • 1 has this problem
  • 15 views
  • Last reply by jondail83

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I use a program called Solver to generate reports and download them in the .xlsx format. After a recent update in Firefox, my downloaded files no longer contain an extension and instead only appear in my download folder as a generic "File".

I've checked and .xlsx files are definitely associated on my computer with Excel. Also when I open the file or later "Always Open Similar Files" they open using Excel no problem.

What's the reason these aren't getting an extension added to them? I've attached a picture where file 1 is what it looks like for a file downloaded using Firefox, file 2 is the same file that is opened at the time of download.

My issue kind of looks like this one and it seems the issue was a bug and the user needed to download a new release of Firefox: https://support.mozilla.org/en-US/questions/1277280

I use a program called Solver to generate reports and download them in the .xlsx format. After a recent update in Firefox, my downloaded files no longer contain an extension and instead only appear in my download folder as a generic "File". I've checked and .xlsx files are definitely associated on my computer with Excel. Also when I open the file or later "Always Open Similar Files" they open using Excel no problem. What's the reason these aren't getting an extension added to them? I've attached a picture where file 1 is what it looks like for a file downloaded using Firefox, file 2 is the same file that is opened at the time of download. My issue kind of looks like this one and it seems the issue was a bug and the user needed to download a new release of Firefox: https://support.mozilla.org/en-US/questions/1277280
Attached screenshots

All Replies (5)

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Does this happen with all .xlsx files or only with files from a specific server ?

What does the Network Monitor show about these downloads ?

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When I download an .xlsx file from Solver, the File name in Network Monitor is called "should-use-legacy-libraries" and a json type. As mentioned before, this download is just called "File". Does that offer any clues? See attached image for the Network Monitor info on this download.

However when I download an .xlsx file from another place, like Google Drive, the file name in Network Monitor is "export?format=xlsx..." which would confirm that it's downloading in Excel format. The type is "vnd.openxmlformats-officedocument.spreadsheetml.sheet".

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How about other file types? Can you see other file types in explorer?

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Hello, No other types that I've tried have any issue. For example PDFs download fine. All file types are visibly correct in File Explorer except for Excel when downloaded from Solver.

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This is almost definitely a Firefox-specific issue although I cannot tell if there is a setting somewhere that I may have toggled that removed the link between downloading this type of file and saving it with a .xlsx file name.

I can say I tried Microsoft Edge for the exact same file and it saved as .xlsx.