In https://nxlog.co/documentation/nxlog-user-guide#om_file_config it mentions;

"In case of dynamic filenames, a cache can be utilized to keep files open. This increases performance by reducing the overhead caused by many open/close operations. It is recommended to set this to the number of expected files to be written. Note that this should not be set to more than the number of open files allowed by the system. This caching provides performance benefits on Windows only. Caching is disabled by default."

However in https://nxlog.co/docs/nxlog-ce/nxlog-reference-manual.html#om_file - there is no mention of this function, and I can't seem to configure it on my current nxlog.conf as it throws

2018-09-04 01:44:13 ERROR invalid om_file keyword: CacheSize at C:\Program Files (x86)\nxlog\conf\nxlog.conf:131 2018-09-04 01:44:13 ERROR module 'out' has configuration errors, not adding to route '1' at C:\Program Files (x86)\nxlog\conf\nxlog.conf:144 2018-09-04 01:44:13 ERROR route 1 is not functional without output modules, ignored at C:\Program Files (x86)\nxlog\conf\nxlog.conf:144

Any ideas? is this something only available in enterprise edition?