How can i limit download speed for specific file extensions

[tuzsuzdeli]

I need to limit download speed for *.rar and *.zip files with traffic shaper.
First, i setup a limiter

name:dl2mb
Bandwidth: 2mbit/s
mask : None

then, i setup layer7 rule
name : limitziprar
protocol : zip and rar
structure : limiter
Behaviour : dl2mb

Should i add a floating firewal rule ? how ?

[dvserg]

Squid Package > Traffic managment