You could upload the html file as you would an image as part of the post and use the Insert into Post button to include a link to the file -or- if the html files have already been uploaded you could insert a link to the html file from its current location in the post.
If you are unsure how to this I can add step by step instructions.
yes please, kayjayone, for example we’ve got
website.com/rates/item1.htm
website.com/rates/item2.htm
website.com/rates/item3.htm…
and these files’ content should be inserted accordingly in to
website.com/post1
website.com/post2
website.com/post3…
For example while in post1…
1. Type in the text you’d like displayed for the link and select or highlight it
2. Click the chain looking – Insert/edit link button
3. In the URL field enter website.com/rates/item1.htm
4. If you want to open the page in a new window so the user does not leave your site, select open in a new window/tab
5. Click the Add Link button
Instructions specific to WordPress 3.1.2
Oh no no no, this will be a link, I want to display ENTIRE CONTENT of that html file INSIDE of a post
html include basically
anyway, i’ve found a solution
module “Include me in that HTML”
http://wordpress.org/extend/plugins/include-me-in-that-html/