Safari asks me do you want to open or save this file?

Hi,

I am testing HLS on-demand service on FMS4.5 using external Apache configuration instead of using built-in Apache server that comes with FMS. Do you know why I got this message on Safari when I visit my local http server? http://localhost/hls-vod/sample2_1000kbps.f4v.m3u8

I checked mime.types file and it says:

Please advise.

Thanks,

Myeong