After unarcing, you will have 4 files:

README.TXT         This file
SAMPLE.RFT         A sample DCA/RFT document.
RFTTOWW.PRG        HISOFT Basic DCA/RFT to WordWriter-ST program.
WWTORFT.PRG        HISOFT Basic WordWriter-St to DCA/RFT program.

DCA/RFT (Document Content Architecture/Revisable Form Text) is a
standard word processing format that can be created  and read by many
IBM-PC compatible word processors such as  DisplayWrite IV,
Professional Write, Word Perfect, and many  others.  This standard
format allows different word processors to  exchange documents while
retaining all the formatting such as bold  face, underline, italics,
etc.

To convert a DCA/RFT file to WordWriter-ST double click on 
RFTTOWW.PRG.  The first file selector allows you to select a DCA/RFT 
file (extension .RFT).  The second file selector uses the same 
.RFT file name with a new .DOC extension.  

The WWTORFT.PRG program does the reverse. It takes a WordWriter-St 
document and converts it to DCA/RFT.  The first file selector 
allows you to select a WordWriter .DOC document and creates a .RFT 
document. 


The following formatting codes will be converted:

    1. Tab (The program assumes that tab stops are set every 5
            positions. Currently, I ignore user set tab stops. 
            I may change my mind on this later)
    2. Indent Tab (Also known as temporary left margin)  (Once again
                   I assume tab stops set every 5 positions.)
    3. Begin/End underscore
    4. Word Underscore
    5. Subscript
    6. Superscript
    7. Begin/end emphasis (Bold)
    8. Center Align
    9. Required Page End
   10. Begin/End Italics 
   11. Carriage Return/Required Carriage Return

Reference: IBM manual SC23-0758-1 Document Content Architecture:
                                  Revisable - Form - Text Reference