Opera can use both browser engines - Presto and MSHTML(IE)!
Opera can open web pages with MSHTML engine(used in Microsoft Internet Explorer). It's very useful for open IE-only web-sites inside Opera's browser window!

See screenshots:
http://kostia.gorodok.net/IEOpera.png
http://kostia.gorodok.net/IEOpera2.png

You can integrate Internet Explorer into Opera using Mozilla ActiveX plugin and special addon.

INSTALLATION

1. Download working netscape-сompatible ActiveX plugins:
http://vvs.post.lg.ua/Opera7/opera-plugins.zip
Extract archive content into Opera\program\plugins\ directory.
Don't forget enable plugins in Opera (press F12 and enable plugins).

NEW UPDATE:
Also you must edit path.js and correct path to existing in you computer
For example:


2. Download special sidebar extension:
http://vvs.post.lg.ua/Opera7/browser.zip
Extract archive content into any folder for example into Opera\OpenInIE

3. For open active page in the Opera by IE engine just add into your user menu file(.INI) into section [Document Popup Menu] this line:


Note: browser.htm you can find in browser.zip archive.

PROBLEMS

There major problems. This solution doesn't work with Windows 98 and some other Windows/IE versions. Opera can crash or hangup in some cases with some windows(ie) version.

BUT it can successfully work with some other Windows/IE version(just see screenshots) without any problems!

To all:

Please check this solution on your computer and wrote your result(success or not) with your software versions include:
1. Opera version
2. Windows version (include Service Pack version)
3. Internet Explorer version (include patches list if it is possible)
Thanks.

Good Job!

Opera has known this to be possible, but would never official sanction this, because it is a security risk. Only use this if you know what you are doing..

NEW UPDATE:
Also you must edit path.js and correct path to existing in you computer
For example:


Tested with Windows SP2 - it's working! Additional solution:
1. Try to enable ActiveX in SP2 Security Center before.
2. Try to disable total ActiveX blocking from your Firewall.

vcv


I don't think so. Why it is security risk? It is security of Internet Explorer only. But anyway you don't have choose when you must visit IE-Only sites.

UNsusesful

1. Opera 8.0 7561
2. Win XP SP2 Taiwan Trad.Chinese
3. IE 6.0.2900.2180.xpsp_sp2_gdr.050301-1519

Neowin homepage tested - Opera freez imediately when MSHTML started drawing the page.

local txt file tested - fine !

local html file tested - freez

Mental blank....Presto is Opera's rendering engine, right?

Just a thought, but the latest Opera version is build 7583 (8.01 preview 1)

hmmm might try this later...

does it only work with a specific version or is any ok..?

It's not as big a security risk as if you were using IE itself. But let's say someone is running XP with w/o SP1 or SP2. Let's say one of their..oh.. crack/warez/something sites doesnt work and they use this to view it. Then let's say they get infected with spyware. Who do you think the person might blame? Sometimes it's Opera.

If there is a security risk at all, Opera won't official sanction it.

Don't get me wrong though, this is neat.