Porting S memo from a Samsung Galaxy 4 to 5 did not work so data was lost for a regular user. The Samsung galaxy 5 offered to update the data, so it could be read by S notes but the outcome had not much similar with the original S memo data.

Luckily the s memo data could be exported on the S4 in snb format. There where other options as pdf or picture formats, this worked well but ended up in a no more editable file.

PC programs as calibre could open snb files but the S4 files could not be opened and ended up in an error message box.

Luckily the data to be saved where just typed in text and snb is a zipped container format. So unzipping it converted the file into a directory structure. The data appeared as xml and could be converted in a ASCII text file using the following command

xsltproc snote.xsl snote/snote.xml > snote.txt

Making use of the stylesheet snote.xsl

<?xml version='1.0'?> 

<xsl:stylesheet 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
  xmlns:sn="http://infraware.co.kr/2012/SNote" 
  version="1.0">
  
<xsl:output 
  encoding="UTF-8" 
  omit-xml-declaration="yes" />

<xsl:template match="sn:t/">
     <xsl:value-of select="."/>
     <xsl:call-template name="Newline" />     
</xsl:template>  
  
<xsl:template name="Newline">
  <xsl:text>
  </xsl:text>
</xsl:template>
  
</xsl:stylesheet>

Don't use it, install google calender app and use it and use google account on a PC