alexjansons opened a new pull request, #545:
URL: https://github.com/apache/poi/pull/545

   Sheets starting with R1C1 cell style reference are enclosed in single quotes.
   
   If this is not the case Microsoft Excel treats formulas with references to 
such sheets as erroneous. 
   It proposes to "repair" corrupted workbook and as a result clears affected 
cells as seen in the image below:
   
![image](https://github.com/apache/poi/assets/43913143/7141f9fe-31d0-43e6-ae40-32c55acc1e1d)
   
   E.g. sheet name `RC123Test`. It should be enclosed in single quotes. Whereas 
`RA` can be left as is, as 'R' following alpha character is not a valid R1C1 
cell style reference.
   
   This behavior is also described here:
   
https://stackoverflow.com/questions/41677779/when-does-excel-surround-sheet-names-with-single-quotes-in-workbook-xml-or-othe/53483274#53483274


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