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Namespace prefix a on extLst is not defined while manipulating Word files

bug

docx

file_errorfile format generation/writing issuefile format generation/writing issue

Status: Open.

#1714 In nissl-lab/npoi;

· tonyqus opened on Mar 5, 2026

·  

NPOI 2.8.1

AltChunk containing docx file corrupts document

docx

enhancement

Status: Open.

#1670 In nissl-lab/npoi;

· kemsky opened on Jan 16, 2026

Stacked Column Chart not currently supported?

question

Status: Open.

#1648 In nissl-lab/npoi;

· muguemjee opened on Oct 15, 2025

sheet.ShiftRows throws System.InvalidOperationException:“Cannot add merged region B3:C3 to sheet because it overlaps with an existing merged region (B3:C3).”

bug

xlsx

Status: Open.

#1646 In nissl-lab/npoi;

· TimLee88 opened on Oct 11, 2025

Add support for threaded comments

enhancement

xlsx

Status: Open.

#1627 In nissl-lab/npoi;

· deanm0000 opened on Aug 21, 2025

·  

NPOI 3.0.0

NumberToTextConverter ignores locale

bug

xls

xlsx

Status: Open.

#1626 In nissl-lab/npoi;

· Bykiev opened on Aug 20, 2025

·  

NPOI 2.9.0

<code>sheet.CopyTo</code> is not copying the style properly.

bug

xlsx

Status: Open.

#1586 In nissl-lab/npoi;

· codenewa opened on Jun 12, 2025

·  

NPOI 2.8.0

Color of legend does not match the color of column in chart if custom colors are used for each column

chart

need-investigation

xlsx

Status: Open.

#1582 In nissl-lab/npoi;

· zsolthungary opened on Jun 6, 2025

Corrupted after calling ShiftRows function to remove the row where the shared formula is defined

need-investigation

xlsx

Status: Open.

#1490 In nissl-lab/npoi;

· 26642523 opened on Feb 14, 2025

XSLF (PPTX) support

enhancement

pptx

Status: Open.

#1480 In nissl-lab/npoi;

· tonyqus opened on Jan 22, 2025

·  

NPOI 3.0.0

Rounding errors are boosted by ROUNDDOWN, VLOOKUP, etc.

formula

need-investigation

Status: Open.

#1457 In nissl-lab/npoi;

· helmkebecksche opened on Dec 9, 2024

·  

NPOI 2.8.0

Implement ISheet.Cells collection to return a cell range

api

enhancement

xls

xlsx

Status: Open.

#1448 In nissl-lab/npoi;

· tonyqus opened on Nov 23, 2024

·  

NPOI 2.8.0