https://bugs.documentfoundation.org/show_bug.cgi?id=158282

            Bug ID: 158282
           Summary: FILEOPEN Incorrect encoding opening MS Excel 4.0 for
                    Macintosh files with cyrillic text
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 190920
  --> https://bugs.documentfoundation.org/attachment.cgi?id=190920&action=edit
MS Excel 4.0 document with Cyrillic text

When I open the old MS Excel 4.0 documents with cyrillic text in Libreoffice ,
they opened with incorrect encoding (became unreadable).

Example is attached. All my Excel documents contain two fonts:
1. Латинский (\x8b\xe0\xf2\xe8\xed\xf1\xea\xe8\xe9)  and 
2. Прямой Проп (8FF0DFECEEE9208FF0EEEF)

1st font is Serif (like Times)
2nd font is Sans Serif (like Arial)

Right inside the binary document I changed the 1st font name to 
"Times CYR" and  2nd font name to "Arial   CYR" (to preserve the length) but it
did not work (opened unreadable again).

Utilities from https://sourceforge.net/p/libmwaw/wiki/Home/ did not help
either.

See also https://bugs.documentfoundation.org/show_bug.cgi?id=158225#c12

I tried to understand here
(https://learn.microsoft.com/en-us/openspecs/office_file_formats/ms-xls/cd03cb5f-ca02-4934-a391-bb674cb8aa06)
what should I change inside Excel document, but its too complicated.

Is that possible to fix libreoffice calc filter to correctly import old excel
documents with at least fonts listed above?

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