What is Corsix TH?
For those of whom are unaware, Corsix TH is an open source attempt to recreate the Theme Hospital engine compatible with modern PC hardware. As the developers do not have their own art and sound teams, they make use of the original Bullfrog game assets. In short this means you need the base game to run it.

On the upside, this project brings about high resolution monitor support and better stability for modern operating systems than the DOSbox versions.

How do I make Corsix TH work for me?*
Firstly, purchase and download GOGs release of Theme Hospital. Install it to your hard drive (I've heard the default install path causes problems in some GOG releases. Install it to C:\games\ just to be sure). Next, download Corsix TH from Here. Install it to the default directory. Once it is installed check the 'launch game' checkbox and click finish. After a short loading process, the menu will appear. Tweak the option if you want, then click the play button. A file browser dialogue will pop-up asking you to direct it to your Theme Hospital directory. Do so, and enjoy.

*Disclaimer: This worked for me, your mileage may vary.

*Edit* Link updated, 04/03/2014

I think you forgot to link to corsix-th: http://code.google.com/p/corsix-th/

There are guides for installing it for any operating system and an issue tracker so that you can read about what to expect will go wrong. If you're running Windows however, you may be best off running the GOG version.

Isn't the whole point of using GoG releases is because it's optimized for Windows 7, thus doing away using hacks/third-party programs to make them work?

I've yet to purchase Theme Hospital from GoG, but when I used Corsix-TH with my copy of TH last year it was somewhat buggy, Janitors were standing idly doing nothing at the 3rd or 4th level, which wasn't normal behaviour, so I gave up playing.

GoG adjusts existing games or in some cases uses DosBox for old Dos games to make them work.

Corsix is an executable, fan-made project where it practically rewrites the game. It uses original files (such as graphics, scripts, sounds, etc) but the engine and everything is rewritten, that is why you have bugs that are not in the original game.

GoG (Dosbox?) version alone will work just fine the same way as the original game run, but if you looking for extended features (such as more resolutions etc) then Corsix 'addon' is for you as well. Keep checking back at Corsix page, he updates it from time to time with new version.

Well, why use source ports in general? In this case you're talking about an early alpha so that sort of thing is going to happen from time to time or even regularly.

You can get improved music for use in CorsixTH here:
http://www.a-base.dds.nl/temp/ThemeHospital_ZRRemix.zip

Yep, CorsixTH is indeed not worth it for the game experience at the moment, but it's improving rapidly - I believe it's more or less fully playable with the latest release.

But for me, the advantage is the same as OpenTTDX gave - cross platform support. I'm playing Theme Hospital on my Kindle Fire right now. It's buggy and fiddly (as it's still very much an alpha port of alpha software) but especially now that TH is on GOG I imagine development will ramp up.

To be clear Corsix-TH is not a 3rd party launcher.....

It is a reimplementation of the game code via reverse engineering the behaviour of the actual game - it does not run the actual game code developed by Bullfrog.

Currently the following is not yet implemented:

* Earthquakes
* Epidemics
* Handyman priorities
* Rats
* Graphs
* Visual effects on patients with serious radiation and jellyitis.
* Fullscreen animations such as the level screen and winning letter.
* Multiplayer

There are also the following known issues:
* If the X-Ray Viewer is inaccessible in the Operating Theatre no image will
be shown on it.
* If the user exits the game via "the cross" when in windowed mode settings
are not saved.
* Radiators and other "edge tile" objects occupy a whole tile instead of
just one edge of the tile.

Development is, of course, on going and it's a fairly active project... so I'm sure it will eventually reach feature parity with the original version.... but the caveats should be known ;)

Wanted to let you guys know that CorsixTH is now v0.10.

Changelog

Not Yet Implemented
- Epidemics
- Rats
- Graphs
- Visual effects on patients with serious radiation and jellyitis.
- Fullscreen animations such as the level screen and winning letter.

Known Issues
- If the X-Ray Viewer is inaccessible in the Operating Theatre no image will be shown on it.
- If the user exits the game via "the cross" when in windowed mode settings are not saved.
- Radiators and other "edge tile" objects occupy a whole tile instead of just one edge of the tile.

Gameplay
- Added: Earthquakes have recently been reported!
- Added: Handyman priorities have been added. They can also be told to stay and respond to calls in one building (parcel) only.
- Added: Staff's happiness will change due to more environmental factors.
- Change: The files containing dumped strings are now created alongside the config file instead of in the installation directory.
- Fix: Handymen will now meander inside a room until the machine which needs repair is free for use.
- Fix: The URL in the config file pointing to better quality music was outdated. Note that this only affects new installations.
- Fix: Two identical entries were shown in the drug casebook if a new disease was discovered when it was open.
- Fix: Don't crash when a saved game with the town map open is loaded.
- Fix: Too large rooms could make them unusable.
- Some graphical glitches have been fixed.

User Interface
- Added: The Map Editor and Animation Viewer have new icons.
- Change: In debug mode all gamelog output is now also displayed in the command prompt.
- Fix: Don't initiate a window move if it happens to be below a top menu selection.
- Fix: Don't show the main menu under any circumstances when closing the options menu in-game.

Map Editor
- Fix: The "Save" and "Save As" buttons now do what they should do.
- Fix: There were some strange log messages on opening the editor.
- Added: The arrow keys can now be used to scroll the map.
- Change: Removed a lot of tiles from the palette, since maps may not work as intended if they would be used

Cheers!

CorsixTH will be v0.11 this month! Stay tuned for more info.

Yes more updates! Can't wait :)

CorsixTH v.011 available since the 17th!

Go grab it!

Gameplay
Fix: Patients were not fully diagnosed according to settings in the policy screen.
Fix: The game now handles a player trying to cheat into an earthquake on levels 1-4.
Fix: It was not possible to sell equipment in rooms if you had a negative balance.
Fix: Handymen could not be placed inside rooms.
Fix: Handymen would get called to clean soot in blown up rooms.
Fix: Machines that need to be repaired will now cancel that request if they are blown up.
Fix: If a cured patient was leaving a room just as it crashed because of an earthquake the game would throw an error.
Fix: Alien DNA could under some circumstances not have the "concentrate research" button clicked without triggering a crash.
Fix: A crash occurring under some circumstances if the player picked up a staff member.

User Interface
Enchancement: Since consultants are unable to learn new skills icons for not yet fully learned skills are now removed when a doctor is promoted.
Fix: Disabling background music no longer disables sound effects on Windows.
Fix: Checking if a sound exists crashed the game if there was no sound archive at all.
Fix: If the player paused the game from the top menu bar while an earthquake was active it would be impossible to scroll.

Graphics
Fix: On a few levels some sliding doors would not animate correctly.
Fix: Vomiting standard males had the wrong animation.

This third party program is great, I hope they will continu to improve it so we can have all the feature of the vanilla!
Thanks for the op for letting me know about it!

How do I get the full version of corsixTH to download from my laptop to my Android tablet.
I have followed directions but for some reason canot do it.
Can any body help me?
Cheers