![]() This group is provided for filter drivers that must attach above all other FSFilter types. This group loads last and thus attaches furthest from the file system. This group is the same as the "filter" load order group that was available on Windows 2000 and earlier. The load order groups are listed as they appear on the stack, which is the reverse of the order in which they're loaded. For each load order group, the Load Order Group column contains the value that should be specified for that group in the LoadOrderGroup entry in the Version section of a filter's INF file. The following table lists the system-defined load order groups for file system filter drivers. Within each load order group, filter drivers are loaded in random order.Ī filter driver that doesn't specify a load order group is loaded after all other drivers of the same start type that do specify a load order group. The following rules about load order groups determine when a file system filter driver is loaded:Ī filter driver that specifies a particular load order group is loaded at the same time as other filter drivers in that group. As a result, load order groups are important to file system filter drivers, because the earlier a filter driver loads, the lower it can attach on the file system driver stack. ![]() On operating systems before Windows XP, filter drivers could use only the "filter" and "file system" load order groups.Ī filter can attach only to the top of an existing file system driver stack and can't attach in the middle of a stack. ![]() Microsoft Windows XP and later operating systems provide a dedicated set of load order groups for legacy file system filter drivers that the OS loads at startup time. ![]() To port your legacy driver to a minifilter driver, see Guidelines for Porting Legacy Filter Drivers. For optimal reliability and performance, use file system minifilter drivers with Filter Manager support instead of legacy file system filter drivers. ![]()
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