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9.11 Filenames encoding

An encoding form parameter can be used to specify the filename encoding ‘encoding=xxx’.

In the absence of a ‘encoding=xxx’ form parameter, the encoding is controlled by the ‘GNAT_CODE_PAGE’ environment variable. And if not set ‘utf8’ is assumed.

The current system Windows ANSI code page.
UTF-8 encoding

This encoding form parameter is only supported on the Windows platform. On the other Operating Systems the run-time is supporting UTF-8 natively.