XML code is displayed while trying to view a file uploaded

[kaygee1]

Open https://connect.topcoder-dev.com/
Login as pshah_manager/topcoder123

Go to this link as this user
https://connect.topcoder-dev.com/projects/2357/specification

Scroll down and click on the file attached

actual - XML code is displayed instead of the file.

expected - correcr version of the file should be opened

Frequency - always

Desktop
OS: Windows 10

Browser: Chrome 64.0.3282.140, Edge 38.14393.0.0, Firefox 58.0.2'