This was posted by a someone over on the Steam forums by a guy called Fr0st.
This worked for me, I'm running win7 64.
"Fixing "Language Not Supported" error
Hey guys,
I too purchased Ship Simulator and then found it didn't work.... did some digging around in the program directory and it looks like there's an installation script that isn't being run for some reason.
Anyway, I managed to get my game to work; I was getting the "Language Not Supported" error, here's how I did it -- I'm not sure if all the steps are necessary but this is what I did.
First some background: I'm running Windows 7, 64-bit edition. Downloaded the game and ran it, only to get the abovementioned error message (Steam _did_ provide me with a CD key, so I didn't have that problem).
There were two things I did that got the game working, I'm just not sure if it was one of them or both that did it Your mileage may vary.....
1. First install and run the game, when you get the "Language Not Supported" message just exit.
2. Run regedit. Look for a key in your registry called 'Vstep', it should be under HKEY_CURRENT_USER\Software
3. Under that key, there should be another key called "ShipSimExtremes" or "ShipSimulatorExtremes" (can't remember exactly off the top of my head, I'm not at my gaming machine).
4. Add a string value under that key called "Language_Ingame". Set the value to EN
5. Exit registry editor
Now, re-launch Steam and try running the game again. You may still get the error message. If so, here's the second thing I did.
1. Exit Steam entirely.
2. Go to your C:\Program Files\Steam directory (on Windows 64-bit it'll be C:\Program Files (x86)\Steam'.
3. Right-click on the Steam.exe icon and select "Run as Administrator...."
4. When Steam comes up, launch Ship Simulator.
At this point, I got the 'License Check' window asking me to type in my CD key; I had gotten past the 'Language Not Supported' error.
After you've done this, you can run Steam normally (exit Steam and then re-start it as your normally would, NOT AS ADMINISTRATOR) and the game should work fine after that.
Some other things:
The UI is very glitchy. If something doesn't seem to work when you click on it, try double-clicking. I had some issues when first creating my profile - I had to click exactly on the '+' icon in the create profile icon (you'll see what I mean after you enter your CD key) and when choosing options from the drop-down menus occasionally I'd have to double-click also.
Another thing, if you look under your Steam\steamapps\common\ship simulator folder, somewhere under that are installation files for the DirectX runtime, the PhysX runtime and the Visual C++ redistributable files. You might want to try running these EXEs if you have any other problems running the game. Again I assume they should be getting run when the game is first launched from Steam but aren't for some reason"
Hope this gets it working for some of you. Like I said it's not my solution but it worked for me.