Zipbook not working when extracted via the Browser UI

Hi ,

A report book has been developed which gets downloaded as a Zip file  on a click on of a button on a Dashboard. 

The process is working flawlessly when I run the Dashboard via the Windows Client . When the same dashboard is accessed via the Browser UI , the file is not processed and it downloads a *.xfdoc.zipbook file which cannot be opened. 

Has anyone faced this issue ?  The client primarily wants to access the dashboards via the Browser so is there any kind of workaround that I can do? 

Thanks in Advance