Can I Open Word Document In Browser Or Calling Ms Word Application Using Html 5 ..?

You cannot. Word documents are not part of W3 standard. You probably saw many sites doing that. They just interpret the files on server side and represent it content with HTML. You can do the same. You need to develop some mapping between HTML and Word documents relevant to your purpose. You can use Open XML SDK:
http://www.microsoft.com/en-us/download/details.aspx?id=30425[^].

By the way, Microsoft warns about using Office Interop in server settings:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q257757#kb2[^],
http://support.microsoft.com/kb/257757/en-us[^].

This way, you can support new XML-based Office formats (such as .DOCX, .XLSX), ECMA-376 standard:
http://en.wikipedia.org/wiki/Microsoft_Office_XML_formats[^],
http://en.wikipedia.org/wiki/Office_Open_XML[^].

This way, you can work without Office installed. Also, the documents are supported by 3rd-party software. Please see my past answers:
Convert Office-Documents to PDF without interop[^],
Need a rather unique WPF text editor control[^],
Hi how can i display word file in windows application using c#.net[^],
Read a word file without using Interop.word dll...Do not want to install word in IIS..[^].

This is another option: http://npoi.codeplex.com/[^].

—SA