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https://issues.apache.org/jira/browse/NIFI-14426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17940706#comment-17940706
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David Handermann commented on NIFI-14426:
-----------------------------------------

Thanks for proposing this improvement [~zhtk]. It is important to note that the 
legacy Excel format has a different set of dependencies, and a different 
parsing approach than the streaming strategy currently implemented for modern 
XLSX parsing. For these reasons, it may be better to implement a different 
Excel Reader. That would require flow-level changes to handle modern versus 
legacy Excel files, but that could be handled through type detection and 
routing.

> Add support for HSSF format in ExcelReader processor
> ----------------------------------------------------
>
>                 Key: NIFI-14426
>                 URL: https://issues.apache.org/jira/browse/NIFI-14426
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Piotr Zalas
>            Priority: Major
>
> Currently ExcelReader processor supports only files in new XSSF (.xlsx) 
> format. Add support for legacy HSSF (.xls) format.



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