How can i execute *.cgi files via browser?

[Dieter Zinke]

I have setup nginx for using perl via this scenario http://wiki.codemongers.com/NginxSimpleCGI. 

I can run *.pl files but not *.cgi files. Callin a *.cgi file via the browser results in a 

You have chosen to open
test.cgi
which is a: BIN file
from: http://example.com
Would you like to save this file?

I ve tried to fix this via the mime.types file

    application/x-perl                    pl pm cgi;

but that doesn' t work. How can i execute *.cgi files like *.pl files via browser url?