Throttle Other Extensions doesn't work

[reza3sw]

Hi
I installed Squid
Now I'm using traffic mgmt and I set this value for "Squid Traffic Managment Settings" :

Maximum Download Size : 0
Maximum Upload Size : 0
Overall Bandwidth Throttling : 0
Per-Host Throttling : 100

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And set this value for "Squid Transfer Extension Settings"

Throttle Only Specific Extensions : Checked
Throttle Binary Files : Checked
Throttle CD/DVD Image Files : Checked
Throttle Multimedia Files : Checked
Throttle Other Extensions : avi,mov,mpeg,mpg,wmv,rm,wma,wmv,wav,mp3,mp4,swf,flv,pdf,doc,ppt,zip,rar,bz2,gz,bin,exe,msi,7z,nrg,iso,mdf

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anyway

When client try to download one file with this extention format ..uses all bandwidth and this setting doesn't have any effect
but when I unchecked "Squid Transfer Extension Settings" then all cleints use 100 KB/s bandwidth set in "Per-Host Throttling : 100"

Now why "Squid Transfer Extension Settings" doesn't work ?
Thanks advance