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Mod Organizer and software that interferes with it



Many, many reports are made about various issues with the functionality of MO that can be attributed to an overly zealous AV package, or some other software that operates on a file without your consent.


  • Whenever you see errors about missing files, or support functions not working, or "failed to spawn '[program name]': failed to start process (Access is denied. [5])" check to see that your AV package hasn't been messing with those before you ask here.
  • Functions that seem to stall or hang entirely are usually because your AV package is stopping the system from operating on those files/folders by either interrupting the copy process or removing the copied file afterward.
  • The running of tools used inside MO, or called from it (e.g. FNIS), have been hindered by these AV packages. Even seemingly unrelated errors about files that contain no executable code can be traced to AV behaviour.
  • For anyone using Windows 10 (or any successive iteration after this post) you will need to go to your settings and follow these steps:
    • Open Settings, and click/tap on the Gaming icon.
    • Click/tap on Game bar on the left side, and turn on (default) or off Record game clips, screenshots and broadcast using Game DVR.
    • Unselect Show Game Bar when I play full screen games that Microsoft has verified

As a matter of course, one of the first things to check when you experience problems is your AV package.

That is not to say these tools are broken or useless, though many are in fact next to useless, but rather the algorithms they use to determine "malicious" behaviour isn't clever enough to distinguish between what is and isn't "bad".


Most AV packages have the ability to set aside certain programmes or folders from the process so that they can operate unhindered, whichever package you use it is strongly urged that you examine how to do so with MO.


Another type of software that routinely causes havoc for MO is "in game overlay" software, from whichever company that provides: AMD, nVidia, Steam, etc. Adding another layer of code into the hooking process is playing with fire as MO will lose control of the process at some point in the execution and your game will likely crash, not load or otherwise fail to function properly.


File backup software is also known to make file access errors with MO as the files that are being accessed, or tried to, are being actively checked by that sort of software. This will interfere with the 'hooking' code of MO.


All the code used by MO is freely available on the GitHub so there is no chance of malicious code being introduced into it. You are of course encouraged to check for yourself if you so desire. 



Not specifically MO related but I have also made a brief guide for removing the more annoying software in Windows 10 that often gets in the way of MO. (Though most of it can be left if you desire.)

Edited by GrantSP
Updated to help with Windows 10 Creator update.
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