hm ok that is strange.
can you try via the windows settings, if you type “default apps” in the search it should take you right to it.
there should be a option for selecting app for file extension, maybe you can change it in there
I don’t have “Choose default apps by file type” option though. I’ll see what I can figure out though. Thanks kromar.
if you have a older operating system you might need to change it in the registry. can you tell me what version of windows you are running?
maybe try searching for Default Programs
I’m on Windows 7 Pro. All my ZBrush plugins work and the all have zsc extension. This is what baffles me because ZBrush is already associated with that file type. I am going to try re-installing Blender because now everytime I try GoB export out of Blender, it just opens a text file. It’s odd though that I don’t have any of these problems with GoB 3_3_8.
its not strange that it works with the old version, that uses some default zbrush GoZ process and in the new version im bypassing that with that zscript to overcome some of the limitations of the default method.
The zbrush plugins work because you opening them usually from within zbrush, this script needs to be executed from the system since i run it from blender so your system needs to load it with zbrush.
That is the reason why it opens a text file because the default is set to notepad and not to zbrush.
you do not have that additional option in the open with context menu?
you can verify and change the default app also via the registry if you are comfortable doing that, you should find it in this location:
HKEY_CLASSES_ROOT\zbrush.script.1\shell\Open\command
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This is what I have…
I had ZBrush Core Mini installed because I was curious but then un-installed it. I don’t know why this is like this. Can I type in the proper value to change it? But, still, GoB version 3.3.8 works no problem.
Yes, I do but for some reason it won’t let me select ZBrush.
ah there you have the problem, it still tries to open the file with zbrush mini as the path in the registry point to that, if you double click on the default entry you should be able to change that to zbrush and that should fix the issue. maybe a reboot is needed.
Ill try that and let you know. Thanks kromar!
update:
Well, I did all that and the Export to zbrush button still just opens a text window. I uninstalled and re-installed Blender and it’s still the same thing. 
update again:
@kromar After all that, I checked again and I finally had the option to choose ZBrush for “Open With” for that particular zsc file in the AppsData folder. It’s all working now. So it must have been the registry tweak that did it.Thanks again kromar…You da’ man! 
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yeah im glad that worked out, i hope not to many will encounter this issue. i will make sure to include this in the FAQ i intend to write for some common trouble shooting issues.
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Hi @kromar
I am having a hell of a time trying to get GoB 3.6.0 (or any other version) to work with ZBrush. I have Blender 3.6.3 and ZBrush 2022.0.8. on Windows 11 Home. In the Blender header, I have 3 GoB buttons, “Export” “Import” and “Manual”. ZBrush GoZ will send the mesh to Blender no problem (I have to enable “Import” in Blender then click “Manual”) but, I cannot Export it back to ZBrush. When I Export back to ZBrush and enter ZBrush again, nothing changes. I have everything installed correctly. I have tried older versions of Blender and older versions of GoB and the result is the same. Blender doesn’t show any script errors either. I hope you can help me with this because it is driving me nuts.
Hi @zber2 do you have the maxon version of zbrush or the pixologic version?
The maxon version is currently not supported and might be the reason for what you describe.
@zber2 There is a newer version, maybe you can try to install this, although there is not really a big change which should fix what you describe.
Try to remove the addon completely, maybe you have multiple versions installed which interfer somehow with the new version.
Also you should try to run the GOZ troubleshooter to make sure that is ok.
EDIT: there have been reports where other addons prevented the GoB export, can you try to disable other addons and see if it starts working?
Also if this is the cause it would be really helpful to know which addon it is so i can find out what its happening and how it could be fixed.
I tried 3.6.1. I downloaded it by clicking “Update” in GoB options. It was the same problem. I also made sure to remove older versions first before installing 3.6.0. I will try disabling other add-ons and will let you know and post back here if I am successful or not. Thanks Kromar!
EDIT:
I disabled every add-on except GoB. It still wouldn’t export to ZBrush. No changes in ZBrush. I removed (deleted) version 3.6.0 and downloaded and installed the version 3.6.1 you posted above. It was still the same problem. Is the “Manual” button supposed to be with Export and Import buttons? That was never there when GoB used to work. I was on Windows 7 when it was working, but now I’m on Widows 11 with new computer. I wonder if that has anything to do with it.
@zber2 The manual button was introduced some versions ago so it is normal to have that 3rd buttons. It could be a windows 11 issue but its strange that there is no error. I will play a bit around and see if i can reproduce the issue.
Did you change any settings in GoB or are you using the default settings?
Thanks @kromar
I’m using the default settings and the correct path to ZBrush.
Hi @kromar
If it helps, I tried this again with Blender 4.0 and got an error report this time. Using GoB version 3.5.99 that comes with Blender 4.0. ZBrush GoZ saves file to disk successfully but niether import or export works in Blender.
Export Error
Import Error
I released a new version with some fixes for 4.0+
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Hi @kromar Welcome back!
Yes! Yes!, it’s working again. That fixed the problem I was having. Thank you Kromar! 
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I made a new release that fixes a error with vertex colors
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I first removed 4.0.3 then installed 4.0.4. I can GoZ out of ZBRush and it imports into Blender OK but when I make changes in Blender and export, ZBrush doesn’t update the changes. The Export button in Blender changes color when clicked but it doesn’t stay on. I tried reinstalling GoZ in Pixologic Troubleshooting folder but it didn’t fix anything. I removed 4.0.4 and installed 4.0.3 again and now that doesn’t work anymore either. No errors in Blender either. Also, I made sure I had the proper paths in GoB options. I am using ZBrush 2022.0.8 and Blender 4.1.1. I also tried uninstalling Blender and reinstalling everything fresh again but that had the same results.
EDIT: I tried 4.0.3 again and got the following error when trying to export.
@kromar edit: Jan. 13, 2025
I tried GoB-4_1_6 with Blender 4.3.2 and it’s working again. Much thanks!