.xla file extension

.xla

Microsoft Excel VBA add-in file.

A .xla file is a Microsoft Excel file which contains an add-in. This provides additional custom functionality to Microsoft Excel. The add-in will be written in VBA.

For more information see:

http://everything.explained.at/Microsoft_Excel/ - Microsoft Excel explained.
http://everything.explained.at/Visual_Basic_for_Applications/ - Visual Basic for Applications (VBA) explained.

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