IIS 6.1 Handlers for HTML, ASP, INC files

[andy5566]

I have a legacy website in which .HTML, .ASP, and .INC files are being used. Problem is all pages have VBScript code not parsed by IIS and thus written on page as static text. I want to fix it. All .html pages include both .ASP and .INC for scripts.Now currently IIS Handlers are as below: all .htm, .html, .inc have IsapiModule handlers as well as ServerSideIncludeModule. This is what I suspect causing issue. So now if I remove ServerSideIncludeModule handlers and just keep IsapiModule, it parses VBScritpt correctly but HTML pages with INC inclusion do not open but ask to save a file to download. What am I missing here? This worked on my localhost fine but not on Production. How can I fix this issue?Thank you!