The Registry Filter is an Embedded-Enabling Feature used to preserve selected registry keys and values on Microsoft Embedded operating systems that use EWF (Enhanced Write Filter) or FBWF (File-Based Write Filter). These two write filters prevent volume or file system updates, respectively, and the Registry Filter is used to allow specific registry settings to "write through" and be preserved even with an enabled write filter. The Registry Filter is especially important when the embedded systems are used in a network Domain.
On the Windows XP-based Microsoft Embedded operating systems in the Applies To section with an enabled write filter and implemented Registry Filter, the Registry Filter may fail to properly preserve registry values. Two specific values supported by Microsoft, the domain secrets key and the TSCALs key may fail to persist which can result in a loss of domain participation or inadvertently running out of Terminal Service CALs. This issue can potentially affect the preservation of user-configured registry keys as well.
On the Windows XP-based Microsoft Embedded operating systems in the Applies To section with an enabled write filter and implemented Registry Filter, the Registry Filter may fail to properly preserve registry values. Two specific values supported by Microsoft, the domain secrets key and the TSCALs key may fail to persist which can result in a loss of domain participation or inadvertently running out of Terminal Service CALs. This issue can potentially affect the preservation of user-configured registry keys as well.