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bad extension of the attachment

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Hello, When downloading a CSV file, the browser renames the file and saves it as a file with no extension as you want to change it What is the reason for this?

Hello, When downloading a CSV file, the browser renames the file and saves it as a file with no extension as you want to change it What is the reason for this?
附加的畫面擷圖

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Looks like a server issue.

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I checked how Chrome will behave and Chrome is downloading correctly

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Chrome doesn't rely on mime file types, so it will download anything, no matter what it is.

Is this a public server? Can we test it?

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Unfortunately, it is an internal server with no external access.