From https://www.pyxll.com/docs/config.html#config-file:
Config values may contain environment variable substitutions. To substitute an environment variable into your value use %(your_envvar_name)s, for example:
verbosity = %(MY_PYXLL_LOG_VERBOSITY)s
external_config = %(USERPROFILE)s\path\external_pyxll.cfg
log = %(TEMP)s\pyxll.log
In PyXLL version < 3.0, the name of the external_config file cannot be "pyxll.cfg".
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