
The OS/2 drivers that are included on Virtualbox Guest Additions were updated at the release of VirtualBox 6.0.2 for other platforms.
Changelog:
- OS/2 shared folders: fixed write regression introduced in 6.0.0 GA
If you are running OS/2-ArcaOS-eCS on a Virtualbox VM you can find this files on "Devices - Insert Guest Additions CD Image...", after that check the OS/2 CD drive inside the /OS2 directory.
Parts of the source code of this drivers can be found on the VirtualBox source code repository.