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* external.cc (get_cygdrive_prefixes): New function. (cygwin_internal): Add CW_GET_CYGDRIVE_PREFIXES case. * path.cc (mount_info::read_cygdrive_info_from_registry): Read system cygdrive prefix if user one is undefined. (mount_info::write_cygdrive_info_to_registry): Write cygdrive prefix to the appropriate registry hive. Overwrite in-memory copy of cygdrive, if appropriate. (mount_info::remove_cygdrive_info_from_registry): New method. (mount_info::get_cygdrive_prefixes): New method. (cygwin_umount): Remove cygdrive prefix, if appropriate. * registry.cc (reg_key::killvalue): New method. * shared.h (class reg_key): Add killvalue, remove_cygdrive_info_to_registry, and get_cygdrive_prefixes declarations. * include/sys/cygwin.h (cygwin_getinfo_types): Add CW_GET_CYGDRIVE_PREFIXES.