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Capture =?utf-8?Q?d=E2=80=99e=CC=81cran_?=2012-03-31 =?utf-8?Q?a=CC=80_?=01.34.16.png	29.2 KB	open | download	Adnan RIHAN	03/30/2012	Read message

Adnan, if it doesn't set the "Content-Disposition" header as per my example, then it doesn't match the location in which this header is set. It is likely that some other location has preference and so the code I provided will never be triggered. Look into your nginx config more closely. Also, check the error log, do you get any warnings? Sometimes, PCRE library may throw a warning, maybe you can use alternative location syntax compatible with an older version of PCRE:

...
location ~ /(?P<filename>(?!/).+\.mp3)$ {
...

Are your mp3 links static at all?

Andrejs