Any data file created in 2009
File type: Accounting, financial and tax file, Various data file
A 2009 file extension identifies a data file associated with the year 2009. It may indicate when the file was created, changed, or backed up rather than specify a particular file format.
The extension is obsolete and is not associated with one specific application or standardized data structure.
File type category:
Accounting, financial and tax file
Various data file
Date updated: October 11, 2026
Record marked as obsolete and not updated for a long time.
The 2009 file extension can be used with various data files. Depending on the source, the file may contain accounting, financial, tax preparation, business, calendar, or schedule data.
Because the extension does not identify a single software product or format, the file's contents cannot be determined from .2009 alone. A filename with two extensions may indicate that .2009 was added to the original extension to record a creation, modification, or backup date.
This extension is obsolete. It does not describe a current, independently supported file format.
There is no universal program for opening a .2009 file. If the filename contains another extension before .2009, remove the .2009 suffix or restore the original extension, then open the file with the application that created it.
If the file has no original extension, identify its source and use the associated accounting, financial, tax, business, calendar, or scheduling application. Do not rename the file unless its original extension is known.
The .2009 file cannot be converted generically because the extension does not define one data format. Conversion depends on the original application and the actual contents of the file.
If .2009 was added as a date or backup suffix, restore the original extension and use the source application to export the data to a supported format.
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