Creates an event source. Extensibility point in the WiX XML Schema. Schema extensions can register additional elements at this point in the schema. The number of categories in CategoryMessageFile. CategoryMessageFile must be specified too. Name of the category message file. CategoryCount must be specified too. Note that this is a formatted field, so you can use [#fileId] syntax to refer to a file being installed. It is also written as a REG_EXPAND_SZ string, so you can use %environment_variable% syntax to refer to a file already present on the user's machine. Name of the event message file. Note that this is a formatted field, so you can use [#fileId] syntax to refer to a file being installed. It is also written as a REG_EXPAND_SZ string, so you can use %environment_variable% syntax to refer to a file already present on the user's machine. Marks the EventSource registry as the key path of the component it belongs to. Name of the event source's log. The "Security" log is not support. Name of the event source. Name of the parameter message file. Note that this is a formatted field, so you can use [#fileId] syntax to refer to a file being installed. It is also written as a REG_EXPAND_SZ string, so you can use %environment_variable% syntax to refer to a file already present on the user's machine. Equivalent to EVENTLOG_ERROR_TYPE. Equivalent to EVENTLOG_AUDIT_FAILURE. Equivalent to EVENTLOG_INFORMATION_TYPE. Equivalent to EVENTLOG_AUDIT_SUCCESS. Equivalent to EVENTLOG_WARNING_TYPE. Extensibility point in the WiX XML Schema. Schema extensions can register additional attributes at this point in the schema.