Nativelmages folders suddently fills up ??

Hello.
In C:\Windows\assembly there seems to be some sort of errors. Folders named Nativelmages_v2.0xxxx and Nativelmages_4.0xxx are filling up, now over 22 Gbyte. From the dates of folders it seems to be in the last 5 days it is gone mad. It seems to be the same date as I flashed a new BIOS to my motherboard. Can this have something to do with it? At the same date the app My Phone cannot connect to my phone anymore. I have tried all Microsofts solutions except reinstalling Windows 10 from scratch! The app and my Phone both are frozen on waiting for permission from "the other" to continue.

What are these folder for?

Windows 10 Pro 18363.535

Burgurne said:

In C:\Windows\assembly there seems to be some sort of errors. Folders named Nativelmages_v2.0xxxx and Nativelmages_4.0xxx are filling up, now over 22 Gbyte...

All my machines have those folders, but they are all a more manageable 500-600MB.

What are these folder for?

Apparently they are the Global Assembly Cache.

The Global Assembly Cache (GAC) is a machine-wide CLI assembly cache for the Common Language Infrastructure (CLI) in Microsoft's .NET Framework.

Global Assembly Cache - Wikipedia

Microsoft said:

Each computer where the Common Language Runtime is installed has a machine-wide code cache called the Global Assembly Cache. The Global Assembly Cache stores assemblies specifically designated to be shared by several applications on the computer....

...Starting with the .NET Framework 4, the default location for the Global Assembly Cache is %windir%\Microsoft.NET\assembly. In earlier versions of the .NET Framework, the default location is %windir%\assembly.

https://docs.microsoft.com/en-us/dot...pp-domains/gac

#3 and the last 18,5Gbyte has arrived at the last 5 days (after BIOS upgrade) That's why I don't know what to do (no yellow triangles in devicemanager aso)

No, I can't explain it either. Though I don't see how the bios upgrade could be involved in .NET Framework. That, I think, is coincidence.

Each of the NativeImages**** folders has its own Temp folder. Mine are all empty, or contain empty folders. If that's where the GB are accumulating, then the first thing I would try is a Disk Clean up, clicking the button to clean up system files.

There is a post here from a few years ago where the NativeImages****\Temp folders were filling up. A third-party AV was the culprit there.

windows - Is it safe to purge %WinDir%\assembly\NativeImages*\Temp\? - Server Fault

sygnus21 said:

I'm on my laptop right now and here, I've got 4 of those NativeImages folders each with data in them and all 4 folders totaling 878 meg....

Yes, I have exactly the same four NativeImages folders.

Anyway using Disk Cleanup with cleanup system files and checking every box didn't change anything.

Did you check the four NativeImages*\Temp folders beforyou cleaned up? I guess yours, like mine, were already empty. I suspect @Burgurne may have a lot of files in their Temp folders, in which case a clean up should help.

Tried the "cleanup disk" app, "Cleanup system files" (my translation from Danish to English), but that did not make a big change about Nativelmages.

I also have 4 folders as shown in #7. After cleaning and reboot, it look like this: