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ERROR_PRINTER_DRIVER_WARNED
AddPrinterDriverEx documents this result for a printer driver that is known to be unreliable on the operating system. The same API provides APD_INSTALL_WARNED_DRIVER as an explicit installation option for a warned driver, which makes this materially different from an ordinary missing-driver result.
The existence of an override does not turn the warning into noise. A deployment system should identify the driver and make the policy decision visible, because spooler reliability can be affected by faulty driver code. Windows driver isolation can reduce the effect of some driver failures by running printer drivers outside the spooler process, but it is not proof that the warned driver is correct.
Record the compatibility decision
- Capture driver name, provider, version, date, environment, and the target Windows version.
- Check for a vendor-supported replacement before using the warned-driver installation flag.
- If installation is intentionally allowed, log that policy choice instead of silently converting the warning into success.
- Review driver isolation configuration as a reliability boundary, not as a substitute for upgrading an unreliable driver.
AddPrinterDriverEx warning behavior · Printer Driver Isolation · Windows print driver packages
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