Index is empty in a chm file compiled with Microsoft HTML help workshop

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CHM

I am working with Microsoft Html Help Workshop and trying to build a help project which has more than 19k help files including html, css, png etc. I built an hhp file as new.hhp and put folllowing lines in it

[OPTIONS]
Auto Index=Yes
Auto TOC=9
Compatibility=1.1 or later
Compiled file=new.chm
Default Window=TriPane
Default topic=HomePage.htm
Display compile progress=Yes
Error log file=log.log
Full-text search=Yes
Index file=Index.hhk
Language=0x409 English (United States)
[WINDOWS]
TriPane="new",,"Index.hhk",,"HomePage.htm",,,,,0xe2520,255,0x304e,
[0,0,800,600],,,,,2,,0
[FILES]
I checked the option to create a binary index as shown here.

I checked the option for including keywords as shown here.

I compiled it as new.chm and it searches for all the required topics but index file is empty as shown here.

I also checked the index.hhk file and it is empty as shown here..

Its not possible for me to include keywords manually for 19k files. What should I do to so that keywords from all html files add to index and I don't get the empty index ? Thanks for paying attention.

What I have tried:

I searched for adding keywords from multiple files to index file, but, did not get solution.