Good afternoon,

I've been enjoying MCE on FSX and decided to re-install my old p3dv5 installation to give it a try.  P3D is running just fine with other addons. After I reran the setup wizard for MCE, P3D crashes within a few moments of trying to start.  Here is the crash log...

Spoiler

Log Name:      Application
Source:        Application Error
Date:          10/5/2025 3:44:18 PM
Event ID:      1000
Task Category: Application Crashing Events
Level:         Error
Keywords:      
User:          ALIENWARE\mgpja
Computer:      ALIENWARE
Description:
Faulting application name: Prepar3D.exe, version: 5.4.9.28482, time stamp: 0x6463925f
Faulting module name: ntdll.dll, version: 10.0.26100.5074, time stamp: 0x0e967e89
Exception code: 0xc0000374
Fault offset: 0x000000000011a3b5
Faulting process id: 0x6C48
Faulting application start time: 0x1DC3638C978402C
Faulting application path: C:\Program Files\Lockheed Martin\Prepar3D v5\Prepar3D.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: 74810f43-978b-433e-8ddb-d02d8fcf30b1
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" />
    <EventID>1000</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>100</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-10-05T20:44:18.8813819Z" />
    <EventRecordID>11960</EventRecordID>
    <Correlation />
    <Execution ProcessID="38332" ThreadID="5116" />
    <Channel>Application</Channel>
    <Computer>ALIENWARE</Computer>
    <Security UserID="S-1-5-21-828957686-3426318508-1345131987-1002" />
  </System>
  <EventData>
    <Data Name="AppName">Prepar3D.exe</Data>
    <Data Name="AppVersion">5.4.9.28482</Data>
    <Data Name="AppTimeStamp">6463925f</Data>
    <Data Name="ModuleName">ntdll.dll</Data>
    <Data Name="ModuleVersion">10.0.26100.5074</Data>
    <Data Name="ModuleTimeStamp">0e967e89</Data>
    <Data Name="ExceptionCode">c0000374</Data>
    <Data Name="FaultingOffset">000000000011a3b5</Data>
    <Data Name="ProcessId">0x6c48</Data>
    <Data Name="ProcessCreationTime">0x1dc3638c978402c</Data>
    <Data Name="AppPath">C:\Program Files\Lockheed Martin\Prepar3D v5\Prepar3D.exe</Data>
    <Data Name="ModulePath">C:\Windows\SYSTEM32\ntdll.dll</Data>
    <Data Name="IntegratorReportId">74810f43-978b-433e-8ddb-d02d8fcf30b1</Data>
    <Data Name="PackageFullName">
    </Data>
    <Data Name="PackageRelativeAppId">
    </Data>
  </EventData>
</Event>

If I use the "delete generated files" tool in P3D, it returns to normal, but doesn't see MCE.  So if I rerun the MCE wizard again, then P3D crashes on start. 

I saw other threads about this and I tried putting FsInsider64.dll on the exclusion list for Windows Defender.  No change.

I also tried the startup with renaming FSInsider64.dll to disabled-FSInsider64.dll.  When I do that P3D starts up just fine.  So I think it is something with FSInsider64?  I am not running in any compatibility mode, and the problem remains whether or not I run as administrator.  

Are there any known issues or fixes? 

Thanks!

Matt

Edited October 5, 2025Oct 5 by OrionGuy
clarification

12 hours ago, OrionGuy said:

Good afternoon,

I've been enjoying MCE on FSX and decided to re-install my old p3dv5 installation to give it a try.  P3D is running just fine with other addons. After I reran the setup wizard for MCE, P3D crashes within a few moments of trying to start.  Here is the crash log...

  Reveal hidden contents

Log Name:      Application
Source:        Application Error
Date:          10/5/2025 3:44:18 PM
Event ID:      1000
Task Category: Application Crashing Events
Level:         Error
Keywords:      
User:          ALIENWARE\mgpja
Computer:      ALIENWARE
Description:
Faulting application name: Prepar3D.exe, version: 5.4.9.28482, time stamp: 0x6463925f
Faulting module name: ntdll.dll, version: 10.0.26100.5074, time stamp: 0x0e967e89
Exception code: 0xc0000374
Fault offset: 0x000000000011a3b5
Faulting process id: 0x6C48
Faulting application start time: 0x1DC3638C978402C
Faulting application path: C:\Program Files\Lockheed Martin\Prepar3D v5\Prepar3D.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: 74810f43-978b-433e-8ddb-d02d8fcf30b1
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" />
    <EventID>1000</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>100</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-10-05T20:44:18.8813819Z" />
    <EventRecordID>11960</EventRecordID>
    <Correlation />
    <Execution ProcessID="38332" ThreadID="5116" />
    <Channel>Application</Channel>
    <Computer>ALIENWARE</Computer>
    <Security UserID="S-1-5-21-828957686-3426318508-1345131987-1002" />
  </System>
  <EventData>
    <Data Name="AppName">Prepar3D.exe</Data>
    <Data Name="AppVersion">5.4.9.28482</Data>
    <Data Name="AppTimeStamp">6463925f</Data>
    <Data Name="ModuleName">ntdll.dll</Data>
    <Data Name="ModuleVersion">10.0.26100.5074</Data>
    <Data Name="ModuleTimeStamp">0e967e89</Data>
    <Data Name="ExceptionCode">c0000374</Data>
    <Data Name="FaultingOffset">000000000011a3b5</Data>
    <Data Name="ProcessId">0x6c48</Data>
    <Data Name="ProcessCreationTime">0x1dc3638c978402c</Data>
    <Data Name="AppPath">C:\Program Files\Lockheed Martin\Prepar3D v5\Prepar3D.exe</Data>
    <Data Name="ModulePath">C:\Windows\SYSTEM32\ntdll.dll</Data>
    <Data Name="IntegratorReportId">74810f43-978b-433e-8ddb-d02d8fcf30b1</Data>
    <Data Name="PackageFullName">
    </Data>
    <Data Name="PackageRelativeAppId">
    </Data>
  </EventData>
</Event>

If I use the "delete generated files" tool in P3D, it returns to normal, but doesn't see MCE.  So if I rerun the MCE wizard again, then P3D crashes on start. 

I saw other threads about this and I tried putting FsInsider64.dll on the exclusion list for Windows Defender.  No change.

I also tried the startup with renaming FSInsider64.dll to disabled-FSInsider64.dll.  When I do that P3D starts up just fine.  So I think it is something with FSInsider64?  I am not running in any compatibility mode, and the problem remains whether or not I run as administrator.  

Are there any known issues or fixes? 

Thanks!

Matt

Hi, Matt. Did you look in the MCE folder (Program Files X86) in P3D? There should be a file named lisence. If not, try to copy and paste it from FSX to P3D. If that doesn't fix it, email support. Ben is very helpful. 

Mike  

5 hours ago, simaddict said:

Hi, Matt. Did you look in the MCE folder (Program Files X86) in P3D? There should be a file named lisence. If not, try to copy and paste it from FSX to P3D. If that doesn't fix it, email support. Ben is very helpful. 

Mike  

Mike,

Thanks for the reply.  The license.key file is located in the MCE folder as you stated, but there is no specific folder in FSX with a license in it in my installation. I think the MCE folder in Program FIles X86 might be separate from any specific flight sim installation? 

I will reach out to Ben.

Thanks again,

Matt

I figured it out.  I was working with Ben on updating one of the aircraft in FSX and I put an FSX aircraft .dll in the P3D "MCE dlls" folder thinking it would work.  This does not work!  The FSX .dlls are 32 bit and the P3D ones are 64 bit. As soon as I removed it, P3D fired up without any issue.

Matt

18 minutes ago, OrionGuy said:

I figured it out.  I was working with Ben on updating one of the aircraft in FSX and I put an FSX aircraft .dll in the P3D "MCE dlls" folder thinking it would work.  This does not work!  The FSX .dlls are 32 bit and the P3D ones are 64 bit. As soon as I removed it, P3D fired up without any issue.

Matt

So, all is well now? Great news!!

Mike

Matt, do you use CCleaner by Piraform? I'ts free. Recently, my P3D was not opening. It went the opening screen. then just shut down. I ran a registry scan(CCleaner), and it found almost 2000 errors. When it fixed them, P3D finally worked again!!

Mike

Edited October 6, 2025Oct 6 by simaddict

3 hours ago, simaddict said:

So, all is well now? Great news!!

Mike

Matt, do you use CCleaner by Piraform? I'ts free. Recently, my P3D was not opening. It went the opening screen. then just shut down. I ran a registry scan(CCleaner), and it found almost 2000 errors. When it fixed them, P3D finally worked again!!

Mike

Mike,

Thanks again for the help.  It turned out not to be any of the above (Though I am thankful that you pointed me to CCleaner... haven't used that program in years, but just downloaded it and it definitely found stuff).  I was getting mixed results on running P3D after starting up my computer.  I finally narrowed it down to Microsoft Defender in the system tray.  As soon as I exited from that (I couldn't find a way to put exceptions in Microsoft Defender) it works like a champ.  It was definitely something to do with the fsinsider64.dll file because I could run P3D fine if I renamed it.  

Bottom Line... I uninstalled "Microsoft Defender" from my system.  Note this is not "Windows Defender" but a paid product offered by Microsoft.  See here... https://learn.microsoft.com/en-us/answers/questions/3935531/why-do-i-have-2-windows-defender-running-is-this-l

Thanks again for the help!

Matt

You're welcome, Matt