Its automatic . .
Under the Strategy Tester log files are written to tester/logs whereas an Expert running live/Demo writes to experts/logs.
RaptorUK:
The file could be "missing" because MT4 is running on Vista or Windows 7, from a protected area of disk such as Program Files, and the logs are getting virtualized into a per-user area of disk. Many, many topics on this subject, e.g. https://www.mql5.com/en/forum/112576
Its automatic . .
Under the Strategy Tester log files are written to tester/logs whereas an Expert running live/Demo writes to experts/logs.
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The file in my log folder is just an old experts file.