enabling hotspot with limit download

hi all

How I can limit download some file extensions like: avi, exe etc.
second How can I enable three things : web proxy, hotspot, limiting of download?

I will be thankful for help

Best Regards

http://wiki.mikrotik.com/wiki/Manual:IP/Hotspot
http://wiki.mikrotik.com/wiki/Manual:IP/Proxy
http://wiki.mikrotik.com/wiki/How_to_Block_Websites_%26_Stop_Downloading_Using_Proxy

Can you notify me with help of my pic attached and code below

[admin@MikroTik] /ip hotspot> print
Flags: X - disabled, I - invalid, S - HTTPS

NAME INTERFACE ADDRESS-POOL PROFILE IDLE-TIMEOUT

0 hotspot1 LAN dhcp_pool1 default 2m


[admin@MikroTik] /ip hotspot profile> print
Flags: * - default
0 * name="default" hotspot-address=0.0.0.0 dns-name="" html-directory=hotspot
rate-limit="" http-proxy=192.168.3.1:8080 smtp-server=0.0.0.0
login-by=http-chap split-user-domain=no use-radius=no

1 name="hsprof2" hotspot-address=192.168.2.1 dns-name=""
html-directory=hotspot rate-limit="" http-proxy=0.0.0.0:0
smtp-server=0.0.0.0 login-by=http-chap split-user-domain=no
use-radius=no

[admin@MikroTik] /ip hotspot user> print
Flags: X - disabled, D - dynamic

SERVER NAME ADDRESS PROFILE UPTIME

0 admin default 8h31m50s
1 hotspot1 abdurrahma... default 1h49m9s
2 hotspot1 ali.alzubaidi default 42m8s
3 hotspot1 hr.controller default 1h29m7s
4 hotspot1 mohammed default 4h45m15s
5 hotspot1 nabeel.bin... default 4h42m9s
6 hotspot1 omerabobaker default 0s
7 hotspot1 sabri.karama default 2h44s
8 hotspot1 saeed.hamran default 5h24m51s
9 hotspot1 saleh.krees default 1h55m53s
10 hotspot1 yahya.jopan default 1h35m42s
11 hotspot1 salim.alai... default 41s
12 hotspot1 khalid default 0s
13 hotspot1 shaji default 0s