As the Foxite forum discussion points out, you can also address this error by modifying your application's code to handle the error more gracefully. If a utility's logic relies on testing the exclusive opening of a .dbf file, it may fail because the .cdx file is locked, not the .dbf . You can update your code to use TRY...CATCH blocks to handle the 'file access is denied' error for the .cdx file specifically and respond accordingly, rather than crashing.
A popup message displays: CDX Error 0x3 1 Exclusive . Causes of the 0x3 1 Exclusive Error
Use tools like PsPing from Microsoft to confirm that port 3389 is reachable without packet loss. cdx error 0x3 1 exclusive
This error frequently appears during:
Two placed resources within the same heap ( D3D12_HEAP_TYPE_DEFAULT ) are accessed simultaneously – the heap itself requires exclusive access per allocation. As the Foxite forum discussion points out, you
: Fully close the game and launcher (Steam, Epic, or Xbox app), sign out, and reboot your PC to clear any stuck processes. Verify Game Files :
: Select the game > ... (three dots) > Manage > Repair. A popup message displays: CDX Error 0x3 1 Exclusive
Security software or automated cloud backups are actively scanning or locking the .CDX file when the application tries to access it.