Special characters in e-mail CSV attachment

Hello,

I am trying to attach a content of internal table as CSV file to e-mail. However, I have a problem with special characters (French in this case) when the file is opened by Excel application. If I open it with Notepad everything looks OK so I thought it is a PC issue. However, if I create a CSV file directly from Notepad, then those characters are OK both in Notepad and Excel which indicates that it could be ABAP problem after all. However, I am not sure.

Here is what I tried:

LV_LINE_STR is a comma-separated string, while line breaks are CL_ABAP_CHAR_UTILITIES=>CL_LF constants.

Attempt 1: Straightforward: handling pure text - result is good, except special characters

CALL FUNCTION 'SCMS_STRING_TO_FTEXT'
    EXPORTING
      text      = lv_line_str
    IMPORTING
      length    = lv_length
    TABLES
      ftext_tab = lt_att_content_text.

  lo_document->add_attachment(
        i_attachment_type     = CONV #( 'CSV'  )
        i_attachment_subject  = CONV #( p_attnam )
        i_attachment_size     = CONV #( lv_length ) 
        i_att_content_text    = lt_att_content_text
  ).

Attempt 2: Maybe UTF-8 conversion (must go through binary) would help? The result was exactly the same as above

DATA:
    lt_att_content_text_bin TYPE solix_tab.
  DATA(lv_line_str_conv) = cl_abap_codepage=>convert_to(
      source                        = lv_line_str
      codepage                      = 'DEFAULT' "'UTF-8'
  ).

  CALL FUNCTION 'SCMS_XSTRING_TO_BINARY'
    EXPORTING
      buffer                = lv_line_str_conv
   IMPORTING
     OUTPUT_LENGTH         = lv_length
    tables
      binary_tab            = lt_att_content_text_bin .

  lo_document->add_attachment(
        i_attachment_type     = CONV #( 'CSV'  )
        i_attachment_subject  = CONV #( 'Item list' )
        i_attachment_size     = CONV #( lv_length ) 
        i_att_content_hex     = lt_att_content_text_bin
  ).

Thanks in advance for your help!

KR,

Igor