Why Am I Getting 'HRESULT: 0x800A03EC' Error When Accessing Excel Worksheet Ranges Beyond 65K Rows?

Excel Worksheet.Range Error "HRESULT: 0x800A03EC" - Troubleshooting Rows Beyond 65K

This article addresses the "HRESULT: 0x800A03EC" error encountered when using Worksheet.Range in Microsoft Excel, particularly when dealing with worksheets containing more than 65,000 rows. This error frequently arises in Office 2007 and earlier versions.

Understanding the Error's Root Cause

The error typically signals an attempt to define a range exceeding Excel's row limit for older file formats. The limitation is 65,530 rows.

The Culprit: Compatibility Mode (.xls)

A common cause is using the older .xls file format (designed for backward compatibility with older Office versions). This format imposes the 65,530-row restriction.

Checking Your Row Count

To verify if your worksheet exceeds the limit, use the keyboard shortcut Ctrl ArrowDown to navigate to the last row. A gap in the row numbering after 65,530 indicates you've hit the limit.

The Solution: Upgrade to .xlsx

The recommended solution is to save your Excel workbook in the .xlsx format. This newer format supports significantly more rows, eliminating the error. Converting your spreadsheet to .xlsx should resolve the "HRESULT: 0x800A03EC" issue.

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