The .fbx model is in the exchange folder (after Ptex), it should gave been brought back into Blender as the Per Pixel .fbx file.

nope Applinks is here C:\Users\<username>\Documents\AppLinks and the default 3dcoat docs folder is located on C:\Users\<username>\Documents\3DCoat   check this folders and delete the COAT_USER_PATH variable restart the comp and try again

Thanks for trying, can you please confirm if you have the C:/Documents directory with "3DCoat2025" and "AppLinks" folders inside? Or is my case special in this regard?

I am out of ideas, sorry.

C:\Program Files\3DCoat-2025 Didn't changed default settings

Do you have installed 3DCoat in the default installation drive C:\ ?

I do use OneDrive. Created the environment variable with exact "C:\Users\3dlog\Documents\My3DCoatData" directory, it changed the link in the relocation menu, but still creates C:/Documents folder even though it's only 17 bytes. Creates it every time, uninstall 3DCoat, installed it again with env variable, still same behavior, creates C:/Documents, Applink don't work. Changed variable to "C:\Users\3dlog\Documents\3DCoat". Nothing changes.

Maybe your comp have Onedrive installed ? (I am shooting in the dark trying to help) 3DCoat have issues with Onedrive installations   Issues with OneDrive installed “3DCoat” is trying to create a user data folder (which contains user settings and assets) inside “C:\Users\USER_NAME\OneDrive\???????\3DCoat”. That is incorrect. It should create it inside “C:\Users\USER_NAME\Documents\3DCoat”. To workaround this problem: Start > start typing “Edit the system environment variables” > Environment Variables… > System variables > New… > Variable name: COAT_USER_PATH Variable value: C:\Users\USER_NAME\Documents\My3DCoatData (specify your user name inside)

I still can't fix it and now I'm starting to lose my mind. Where should the preferences be stored? For some reason on first running it creates "C:/Documents" directory. There are only "3DCoat" and "AppLinks" folders inside. I already have two documents directories on my machine, I don't want third. Can it be confused somehow? Does everybody else have "C:/Documents" folder specifically for 3d coat? I've used "Relocate 3DCoat's Data", restart it, but it didn't fixed anything for Applink and just created the "3DCoat.txt" file in the "C:/Documents" with the link to new location. I delete it, and on starting 3dcoat it creates again, even though I've relocated prefs to regular documents in users folder. I've reinstalled the app a couple of times after cleaning all the directories and regs, but it still creates this cursed customized documents. I don't see any strange environment variables for it. Is it weird behavior, or is it just quirks of Coat and it works as it should?

Desktop 2025-10-26 00-02-36.mp4     also voxels are giving a strange grouping on polys , voxels use to disperse evenly over the mesh but now it groups them  

As I know... Blender does not have built-in support for Ptex.

Something else is wrong. If I send as Per-Pixel painting, And get back all is well.  But is I use Ptex Paint and use get back I have nothing. The .fbx file is in the exchange folder. I can export manually into Blender and I get the model but without the textures. When I import the .fbx file for the Per-Pixel painting I get the model along with the textures. I havent tested in modeling.

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<- 4.5.2 here & 2025.11 io_coat3D = C:\Users\<username>\AppData\Roaming\Blender Foundation\Blender\4.5\extensions\user_default (file attached) Exchange folder = C:\Users\<username>\Documents\AppLinks\3D-Coat\Exchange\ Exchange_folder.txt = C:\Users\<username>\Documents\3DC2Blender   note: Before had send the mesh from Blender to 3DCoat, to get Getback applink working, you need to use this command first: File > Open in external app. Do not use Export to Belnder and then GetBack.     io_coat3D.rar

do you haave amd ryzen?  

I checked it out.  V4.9 seems to run smoother than 2025.11  Tested with 24 million polygons. when 6 million polygons, that's not a big problem. I use pinch tool.   V2025.11  2025.mp4     V4.9.6 49.mp4     my PC spec. This is a laptop PC made around 2022 years.