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Unable to Evaluate Formula while referencing an external workbook

formula

need-investigation

xssf

Status: Open.

#1442 In nissl-lab/npoi;

· hitensam opened on Nov 11, 2024

How can I reaplce text in word document include image?

enhancement

help-wanted

xwpf

Status: Open.

#1169 In nissl-lab/npoi;

· tonyqus opened on Aug 23, 2023

AltChunk containing docx file corrupts document

enhancement

xwpf

Status: Open.

#1670 In nissl-lab/npoi;

· kemsky opened on Jan 16, 2026

sheet.CopyTo is not copying the style properly.

bug

xssf

Status: Open.

#1586 In nissl-lab/npoi;

· codenewa opened on Jun 12, 2025

A built-in way to validate a cell value based on Excel data validation constraints?

enhancement

help-wanted

xssf

Status: Open.

#1231 In nissl-lab/npoi;

· tonyqus opened on Dec 3, 2023

Excel Function Implementation III

Status: Open.

#1722 In nissl-lab/npoi;

· tonyqus opened on Mar 11, 2026

NPOI setting a new workbook ThemesTable copied from another workbook ThemesTable does nothing

need-investigation

xssf

Status: Open.

#1380 In nissl-lab/npoi;

· EugenM88 opened on Jul 4, 2024

Implement ISheet.Cells collection to return a cell range

api

enhancement

hssf

xssf

Status: Open.

#1448 In nissl-lab/npoi;

· tonyqus opened on Nov 23, 2024

ExcelStyleDateFormatter incorrect Format result

bug

help-wanted

hssf

xssf

Status: Open.

#863 In nissl-lab/npoi;

· fortnum opened on Jun 27, 2022

Add AreaReference support for structured table references

enhancement

formula

xssf

Status: Open (in progress).

nissl-lab/npoinumber 1750

#1750 In nissl-lab/npoi;

· ken-swyfft opened on Mar 23, 2026

Excel has new default font Aptos, NPOI should not set a default FontName

enhancement

font

xssf

Status: Open.

#1417 In nissl-lab/npoi;

· desdoades opened on Sep 13, 2024

Developer Friendly API Implementation

api

Status: Open.

#1775 In nissl-lab/npoi;

· tonyqus opened on Mar 31, 2026

Formula evaluation fails (ErrorCode 15) when using TEXT() function with date

bug

formula

Status: Open.

#1787 In nissl-lab/npoi;

· SDNA-ALP opened on Apr 3, 2026

Introduction to Open Source Maintainence Fee license

Commercialcommercial featurecommercial feature

Status: Open.

#1785 In nissl-lab/npoi;

· tonyqus opened on Apr 3, 2026

Allow null font name, Excel uses default font

enhancement

xssf

Status: Open (in progress).

nissl-lab/npoinumber 1778

#1778 In nissl-lab/npoi;

· opencode-agent opened on Apr 1, 2026

Microsoft Word and Microsoft Excel cannot open generated documents in version 2.8.0

file_errorfile format generation/writing issuefile format generation/writing issue

regression

xssf

xwpf

Status: Open.

#1801 In nissl-lab/npoi;

· sergeidorodnov opened on Apr 15, 2026