Solution : https://service.sap.com/sap/support/notes/788449 (SAP Service marketplace login required)
Key words : 
byte sequence ef bb bf, text mode encoding utf-8, read dataset statement reads, skipping byte-order mark, utf-8 byte-order mark, byte-order mark, abap program creates, communication partner expects, statement open dataset, open dataset statement
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| 1375438 | Globalization Collection Note | 
| 1319517 | Unicode Collection Note | 
| 1038151 | Legacy files in LSMW: BOM for UTF-8 not possible | 
| 910857 | Incorrect characters (#) in batch input session | 
| 863392 | RFBIBL00: The first record is not a session record | 
| 855495 | RFBIDE00 / RFBIKR00: First record is not a session record | 
| 752835 | Usage of the file interfaces in Unicode systems | 
| 747615 | Tool for converting files from one code page to another | 
| 27 | Recommendations for the ABAP file interface |