William Roeder #:
Look in the correct place. «DataFolder»
How to make csv file..... - Expert Advisors and Automated Trading - MQL5 programming forum #9 (2022)
FileOpen, FileWrite not working in onTester() - Strategy Tester - MQL5 programming forum (2020)
Thanks for the reply. It helped

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Now I would like to know if when running it in the strategy tester, the writing on file operations are still going to work or strategy tester only deal with the transactions operations.