Character conversion changing "-" to ?

Some printable characters are being converted to ? in flat files/integrations. For example, a hyphen is fine but an en dash or em dash will create a ? in the IER12 file.

Start with the IER12 flat-file integration and reproduce the reported conversion using an en dash and em dash alongside a hyphen. Trace where printable characters are encoded or written, then verify that the affected characters remain intact instead of becoming ? in the generated file.

Written by the indexing model from the issue text.