.2009 is Any data file created in 2009
Key Features: .2009 File Extension
What is an .2009 file?
The 2009 file extension is maybe associated with various data file types. File could be created or backed up in 2009.
Also may include some kind of financial, tax preparation, business, calendar, schedule, accounting data.
If the file name contains two extensions, try to rename the file to the original extension (delete the 2009 extension from the file name).
This 2009 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.