(Edit:Thanks for N1ghtmare for also bringing this up because I forgot to mention it here I believe, go to your steam folder and find the "Steam.dll" file in it, copy it, and put it in the main folder for Jade Empire , try this first then everything else later, usually this works for other games)

Step 1: Download the 4gb patchhttps://ntcore.com/ (this program is used by various modders from other ((old)) games to make the .exe file to use more then 2 gigs of RAM or video memory) once installed and you selected the 4gb.exe you have to find the games .exe's the .exe's (are in C:/Program files86x/Steam/Steamapps/JadeEmpire) or where ever you have your Jade Empire main file at where it contains the .exe's, and select them to update.

Second: Set all the .exe's (in C:/Program files86x/Steam/Steamapps/JadeEmpire) or where ever you have your Jade Empire main file at where it contains the .exe's by right clicking on them, going to properties then going to the compatibility tab in it:

then selecting the box that has "run this program in Comp. mode" on, then going to the dropdown bar, select "Windows Vista Service Pack 2"

then after that go down and select "disable fullscreen optimisations" on

then if "run on admin *isn't on* select it *to be on*

then after that select "change high dpi settings" box

then after that

check off *both* of the boxes in the new window there then press ok

then after your done with both of the boxes, close the window that you were just on, in the first
window in the .exe's properties click apply on the bottom of it.

Go to the main file, in there, there should be a file called data, in that data folder, created a "SystemInformation.xml" file (do this by right clicking, selecting new, then selecting text document)
((if you can't do this in the data file, try it on the desktop then dragging it in it))

no need to put anything in the text file, you just need the phyiscal file and the title which you named it up above

now go to JadeEmpire.ini and (change the following, changes will be indicated with a * ) ((Reasons: ClampFPS to 59 for a solid 59 frames because old games that are played on "newer" machines can't run a solid 60 frames per second, widescreen is broken and will crash your game (((which is 0 to turn it off))), ScrW is ScreenWidth which is 1920, ScrH is ScreenHeight which is 1080 for modern computers, Windowed mode is the only mode which can run the game (((which is 1 to turn on))), RefreshRate to 59 because of first reason stated above.))

[Difficulty]
Combat=1
Minigame=1
[Feedback]
Subtitles=2
Rumble=1
MiniMapMode=1
[Game]
ShellChapter=1
SaveGameSortAscending=0
ScreenShotJpg=1
ClampFPS=59*
[Minigame]
MGStatus=0
WeaponStatus=0
[Sound]
EnviroFX=1
NoSound=0
SoundFXVolume=80
MusicVolume=80
MovieVolume=80
VoiceVolume=80
[Render]
D3DAdapter=0
Widescreen=0*
ScrW=1920*
ScrH=1080*
DispFmt=1
Windowed=1*
SkinSW=0
SoftShadows=1
FSAA=0
BloomLighting=1
FrameBufferFx=1
FocusTrails=1
ForceShader1=0
NoMovies=0
NoLogos=0
FontScale=50
AllowAtiFSAA=0
PresentImmediate=0
VertexOpt=1
RefreshRate=59*


now go to your *Steam* master file where it contains your steam.exe (C:/Programfiles86x/Steam) or wherever you have it, find the Steam.dll file in it, then copy and paste that file into the JadeEmpires file which has the .exe's in it, to fix the "Steam cannot to be found" bug (if encountered)

Use the TestApp.exe to launch the game, launcher will appear, select play or start or whatever it says
there done, it works


(bonus: go to the jade empire folder, right click on the TestApp.exe, then hover over the "send to" option, then find and select "to desktop", for now on launch the game through the shortcut you just created)