I search online for docx to doc converters. I found one which was quite popular. It had lots of hits but it failed to do the job... Hoo hoo.
Then I stumbled upon Zamzar. Zamzar is a converter that is like the previous one I mentioned. But it successfully converted the docx file to doc. Together with the comments!! The link to zamzar can be found below.
If you are too lazy though, there is another uglier way to open docx files without conversions. Set your windows to show all file extensions, and then change the file name to zip. For example, if you have hhhhh.docx, change it to hhhhh.zip. Then open the zip file and you will see lots of xml files. If you open the files, you should see all the data there! No need docx to doc coverter. How is that?