I have same issue :-(
version 5.00 build 2860
Any idea how to solve?
Hi, according to what is written in the Metaquotes documents, I believe not.
https://www.metatrader5.com/en/terminal/help/start_advanced/start
"If no extension is specified in the file name, the ".htm" extension is automatically used for testing reports, and ".xml" is used for optimization reports."
So the only way would be to automate at least one parameter to generate an XML report.

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Can I export testing result in Open XML file by command line?
This documantation say that about "Report" parameter:
Report — the name of the file to save the report on testing or optimization results. The file is created in the trading platform directory. You can specify a path to save the file, relative to this directory, for example, \reports\tester.htm. The subdirectory where the report is saved should exist. If no extension is specified in the file name, the ".htm" extension is automatically used for testing reports, and ".xml" is used for optimization reports. If this parameter is not set, the testing report will not be saved as a file. If forward testing is enabled, its results will be saved in a separate file with the ".forward" suffix. For example, tester.forward.htm.
Even informing ".xml" extention on the name, it awalys exports ".htm" file. I tried many extensions like ".xls", ".xlsx", ".xsl"...
Follow below part of my .ini file
Thanks!