I cannot open .flv files in WMM while I installed K-lite codec pack

I installed the K-lite codec pack to be able to open .flv files in Windows Movie Maker, but I still cannot open these file sizes.
How is this possible?
Please, don't answer things like: "WMM is bad use another one".
No, I am searching for the solution to this problem.
I am glad if someone would like to help me out.
My Movie Maker version is 2012 (Build 16.4.3528.0331).

Copy this information here:
Codec Tweak Tool > Generate Log

File name: c:\windows\system32\ffdshow.ax
CLSID: {0F40E1E5-4F79-4988-B1A9-CC98794E6B55}
Merit: 00400000 = MERIT_UNLIKELY

Description: Haali Media Splitter
File name: c:\windows\system32\splitter.x64.ax
CLSID: {55DA30FC-F16B-49FC-BAA5-AE59FC65F82D}
Merit: 00800001 = MERIT_PREFERRED + 1

Description: Haali Media Splitter (AR)
File name: c:\windows\system32\splitter.x64.ax
CLSID: {564FD788-86C9-4444-971E-CC4A243DA150}
Merit: 00400000 = MERIT_UNLIKELY

Description: MPC-HC CDXA Reader
File name: c:\windows\system32\cdxareader.ax
CLSID: {D367878E-F3B8-4235-A968-F378EF1B9A44}
Merit: 00600000 = MERIT_NORMAL

(A total of 82 filters, 6 shown, 76 hidden)

##### ICM Class Manager (32-bit) #####

(A total of 5 filters, 0 shown, 5 hidden)

##### ICM Class Manager (64-bit) #####

Description: ffdshow video encoder
File name: c:\windows\system32\ffdshow.ax
CLSID: {4DB2B5D9-4556-4340-B189-AD20110D953F} (ffdshow video encoder)
Merit: 00100000 = MERIT_SW_COMPRESSOR

(A total of 3 filters, 1 shown, 2 hidden)

##### Default source filters (32-bit) #####

(A total of 58 default source filters, 0 shown, 58 hidden)

##### Default source filters (64-bit) #####

(A total of 56 default source filters, 0 shown, 56 hidden)

##### ACM and VFW Codecs (32-bit) #####

Description: Ogg Vorbis Audio CODEC
ID: msacm.vorbis
File name: C:\WINDOWS\SysWOW64\vorbis.acm

Description: CineForm HD VFW Codec
ID: VIDC.CFHD
File name: C:\WINDOWS\SysWOW64\cfhd.dll

(A total of 16 codecs, 2 shown, 14 hidden)

##### ACM and VFW Codecs (64-bit) #####

Description: Ogg Vorbis Audio CODEC
ID: msacm.vorbis
File name: C:\WINDOWS\system32\vorbis.acm

Description: CineForm HD VFW Codec
ID: VIDC.CFHD
File name: C:\WINDOWS\system32\cfhd.dll

(A total of 15 codecs, 2 shown, 13 hidden)

The log is incomplete.
Remove Haali Media Splitter and ffdshow.

What error do you get? Exclamation mark on the import, or black screen, or something else.

Test if you are able to open your .flv file with GraphStudioNext (included in K-Lite Full/Mega). If that works, then it should also work in WMM.

I get error code 0x946002C.
I turned off Haali Media Splitter and ffdshow and still it doesn't work.
But I have a kind of a solution for the problem I had.
Thank you for helping, if I have more questions I will post them.

What is your solution?

The 64-bit version of the Vorbis codec that you have installed can also cause trouble in some applications. You can disable it with Codec Tweak Tool.

It is a temporary solution: the problem was that my OBS made corrupted MP4 files, so I had to make videos in .flv. But WMM can't load .flv. Now I've updated OBS, and it makes working mp4 files by now. But still I have some problems sometimes with loading .mp4 in WMM.

I can't find the Vorbis codec in the Tweak Tool

Vorbis is in ACM/VFW section.

You could try remuxing the files to .mkv with MkvToolNix. Maybe WMM likes them better then.

Oke thank you!