Why is the IBM437 encoding not supported in boost::locale with the Win32 API
("wconv") backend?
The following call will fail with a boost::locale::conv::invalid_charset_error
when using the Win32 API backend:
boost::locale::conv::to_utf<char>("abc", "IBM437")
This is because "ibm437" is not contained in the all_windows_encodings variable
in wconv_codepage.ipp (nor is "cp437" or another alias).
As per Win32 API documentation
(https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar,
https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers),
this encoding is supported in Win32 API. Furthermore, IBM437 is the legacy
encoding of filenames in ZIP files, so it should be quite common.
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