Microsoft Excel 98 for Mac add-in file
File type: Plugin, addon file
An .xla8 file is an add-in workbook created for Microsoft Excel 98 for Mac. It extends Excel with additional commands, functions, or other features.
The file belongs to Microsoft Excel and is not a normal spreadsheet intended for editing as a standalone workbook.
File type category:
Plugin, addon file
Date updated: September 24, 2026
The .xla8 file extension identifies an add-in for Microsoft Excel 98 for Mac, Microsoft's spreadsheet application. An add-in is a workbook that Excel loads to provide additional functionality.
An XLA8 file can contain VBA macros, custom functions, commands, and supporting workbook data. When installed, Excel makes the add-in's features available while the add-in workbook operates in the background.
XLA8 is a legacy format associated with the classic Mac version of Excel. The default file extensions used by Microsoft Excel for add-in files are xla or xll. Current versions of Microsoft Excel for Windows and Microsoft Office for Mac on Apple macOS or Mac OS X may not support this older format.
Open an XLA8 file with a compatible version of Microsoft Excel, preferably Microsoft Excel 98 for Mac. In Excel, use the Open command and then install or enable the add-in if necessary.
Current Microsoft Excel for Windows and Microsoft Office for Mac may report that the file is unsupported. If so, a legacy Mac environment or a compatible older installation of Excel is required.
There is no generally reliable standalone converter for the XLA8 add-in format. If a compatible version of Excel opens the file, save or recreate it in a newer Excel add-in format.
Macros and custom functions may require manual adaptation before they work in a current version of Excel, so the original file should be preserved during any conversion attempt.
Software applications that handle other tasks involving xla8 files:
Microsoft Windows
Apple macOS / Mac OS X
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