[Windows] How to run GTA:SA open.mp (Steam version)

[WG1337]

Info

What is this guide for?
- Windows users (this guide should work on most Windows versions)
- Almost any x86 hardware
- Steam users
- Those who have a legal copy of Grand Theft Auto San Andreas (Classic version), this is NOT for "HOODLUM" users

Steps

1) Open up Steam

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2) Open the "LIBRARY" tab and search for "San Andreas"

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3) Select the correct version (not the Definitive Edition) and press "Install"

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4) Install the game on your "C:" drive and press "Install"
Note: It is not recommended to change the install destination. You can delete this game after you have finished this guide.

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5) Wait for the installation to finish and you can close up Steam

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6) Download SADowngrader: https://services.rockstarnexus.com/sado ... 1_Full.exe

7) Run the downloaded file

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8) Press the "Extract" button

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9) Right-click on the "sadowngrade1-3-1.exe" file

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10) Press "Show more options"

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11) Press "Properties"

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12) Select the "Compatibility" tab, add a checkmark next to "Run this program in compatibility mode for" and select "Windows 7", then press "OK"

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13) Run the "sadwongrade1-3-1.exe" file

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14) Press "Yes"

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15) Press "No"

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16) Press "OK"

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17) Press "OK"

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18) Wait for the scan to complete and press "Downgrade"

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19) Press "Yes"

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20) Navigate to "C:\Program Files (x86)\Rockstar Games" (create the folder if it does not exist), right-click on empty space inside the window, press "New" and then "Folder"

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21) Create a folder called "GTA San Andreas" and press "Select folder"

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22) Press "Yes"

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23) Press "Yes"

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24) Wait for the downgrade to finish and press "OK"

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25) Press "Exit"

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26) Press "Yes, this program worked correctly"

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27) Download ASI loader: https://github.com/ThirteenAG/Ultimate- ... -Win32.zip

28) Extract the "vorbisFile.dll" file from the downloaded ZIP file and copy it to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas" folder, replace any existing files.

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29) Download Modloader: https://github.com/thelink2012/modloade ... loader.zip

30) Extract the "modloader" folder and the "modloader.asi" file from the downloaded ZIP and copy it to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas" folder

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31) Download SilentPatch: https://github.com/CookiePLMonster/Sile ... atchSA.zip

32) Extract the "SilentPatchSA.asi" and "SilentPatchSA.ini" file from the downloaded ZIP and copy it to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas" folder

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33) Download WidescreenFix: https://github.com/ThirteenAG/Widescree ... chived.zip

34) Extract the "GTASA.WidescreenFix" folder from the downloaded ZIP and copy it to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader" folder

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35) Download WidescreenFix HOR+: https://github.com/ThirteenAG/Widescree ... /wshps.asi

36) Copy the downloaded "wshps.asi" file to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\GTASA.WidescreenFix" folder

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37) Create a new folder called "Project2DFX" in "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader" folder (Right-click, select "New", then select "Folder")

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38) Download Project2DFX: https://github.com/ThirteenAG/III.VC.SA ... ct2DFX.zip

39) Extract all the files from the downloaded ZIP file and copy them to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Project2DFX" folder

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40) Create a new folder called "Ginput" in the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader" folder (Right-click, select "New", then select "Folder")

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41) Download Ginput: http://silent.rockstarvision.com/uploads/GInputSA.zip

42) Extract all the files from the downloaded ZIP file and copy them to the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Ginput" folder

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43: Download FramerateVigilante: https://fileservice.gtainside.com/downl ... ilante.zip

44) Extract the "FramerateVigilante" folder to the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader" folder

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45) Open the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Project2DFX\III.VC.SA.LimitAdjuster.ini" file using Notepad or any other text editor

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46) Change the following lines so they match the following settings:

Code: Select all

FrameLimit = 60
MemoryAvailable = 1024
Vehicles = 200

47) Select "File", then select "Save as"

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48) Save the file in a DIFFERENT location, for example, inside "Downloads", make sure you set Save as type: All files", then press "Save"

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49) Copy the newly saved file and place it in the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Project2DFX" folder. replace any existing files

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50) Open the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Project2DFX\SALodLigjts.ini" file using Notepad or any other text editor

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51) Change the following lines so they match the following settings:

Code: Select all

CoronaRadiusMultiplier = 0.3
MinDrawDistanceOnTheGround = 500
Factor1 = 5.0
TimedObjectsDrawDistance = 6000.0
LODObjectsDrawDistance = 6000.0
GenericObjectsDrawDistance = 500.0
AllNormalObjectsDrawDistance = 200.0
//NeonsDrawDistance = 0.0

52) Select "File", then select "Save as"

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53) Save the file in a DIFFERENT location, for example, inside "Downloads", make sure you set Save as type: All files", then press "Save"

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54) Copy the newly saved file and place it in the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\Project2DFX" folder. replace any existing files

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55) Open the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\GTASA.WidescreenFix\scripts\GTASA.WidescreenFix.ini" file using Notepad or any other text editor

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56) Change the following lines so they match the following settings:

Code: Select all

CarSpeedDependantFOV = 0.0

57) Select "File", then select "Save as"

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58) Save the file in a DIFFERENT location, for example, inside "Downloads", make sure you set Save as type: All files", then press "Save"

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59) Copy the newly saved file and place it in the "C:\Program Files (x86)\Rockstar Games\GTA San Andreas\modloader\GTASA.WidescreenFix\scripts" folder. replace any existing files

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60) Download SA-MP: https://gta-multiplayer.cz/downloads/sa ... nstall.exe

61) Run the SA-MP installer

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62) Press "I Agree"

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63) Press "Install"

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64) Press "Finish"

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65) Download open.mp launcher: https://github.com/openmultiplayer/laun ... -setup.exe

66) If experience the following error, then press "Resume"

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67) Run the open.mp launcher installer

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68) If you get the following notification, then press on it and read the second post below

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69) Press "Next"

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70) Press "Next"

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71) Press "Install"

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72) Press "Next"

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73) Press "Finish:

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74) If you get the following notification, then press on it and read the second post below

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75) Run open.mp launcher by double clicking the desktop icon

76) Change the nickname and press the "+" button

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77) Type in the server's address and press "Add"

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78) Right click on the added server and press "Connect"

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79) Select the latest SA-MP version (currently it is 0.3.7-R5) and press the button

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80) You will be prompted that GTA San Andreas path is not set, press the "Open Settings" button

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81) Press "Browse"

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82) Browse to "C:\Program Files (x86)\Rockstar Games\GTA San Andreas" and press "Select folder"

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83) Press the "X" button

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84) Right click on the added server again and press "Connect"

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85) It is possible you will get the following message, in such cases select "INI files: replace all and keep settings" and press "Restart this application with elevated permissions".
The single player mode will start up, but you should exit it and connect to the server using open.mp launcher again. This should not appear next time you run it.

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[WG1337]

Dealing with Windows Defender

As of April 2026, Windows is preventing open.mp launcher from working. This will most likely be fixed in the future. For now, you will need to explicitly allow open.mp launcher in your Windows Defender.

To do this, follow these steps:
1) Either open the Windows Defender notification or open Windows Defender using Windows search

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2) Press "Protection History"

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3) Look for the most recent entry and click on it

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4) Make sure the entry does mention "omp-launcher", then press "Actions" and "Restore"

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5) You may now try to run open.mp launcher (or installer) again.

6) If you receive the same notification again, open it, open the latest entry related to "omp-launcher", press "Actions" and then "Allow on device"

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7) You may now try to run open.mp launcher (or installer) again.

8) You may need to repeat these steps again. Windows Defender will prevent the app from working in 3 different stages so you should expect to allow it 3 times
- during downloading (will ask you to restore the file)
- during installing (will ask you to allow the installer)
- during first run (will ask you to restore it)

[WG1337]

RESERVED