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(PERF_DATA_FILE_COUNT): New constant. (fhandler_registry::exists): Add check for HKEY_PERFORMANCE_DATA value names. (fhandler_registry::fstat): For HKEY_PERFORMANCE_DATA, return default values only. (fhandler_registry::readdir): For HKEY_PERFORMANCE_DATA, list names from perf_data_files only. (fhandler_registry::fill_filebuf): Use larger buffer to speed up access to HKEY_PERFORMANCE_DATA values. Remove check for possible subkey. Add RegCloseKey (). (open_key): Replace goto by break, remove label. Do not try to open subkey of HKEY_PERFORMANCE_DATA. Add missing RegCloseKey () after open subkey error.
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