Index tab of Master chm file containing multiple merged Projects(in Chinese) contains garbage values

Hi There, 

Can you guys please help me out with this really tricky issue?

I am currently using RoboHelp 2019 to maintain content of 5 projects in Asian languages (Japanese, Chinese simplified and Chinese traditional). Output is in chm format.

When my Windows OS is run in English language and I open any of these Asian language projects, my observation for each set of these 5 projects is that index is displayed as garbage values. These garbage values are displayed if the Binary Index checkbox (in Project Settings UI of Project Ribbon bar) is checked. If I uncheck this checkbox,  then I get index with proper Asian language script. 

The problem arisis with the separate master.chm file which contains its own set of webpages plus all the 5 chm projects as merged files. Garbage values get displayed in the index tab. Irrespective of whether I check or uncheck the index, the problem persists. The merged indexes resolutely retain rubbish values. 

Can you please help me out? Is this problem arising because I am generating chm files in Asian languages while my OS is in run in English language? Is there any code to be added or settings to be changed? 

Kindly help.