Files with undo file extension are usually used by many applications for their backup files.

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UNDO file extension - Backup data

What is undo file? How to open undo files?

File type specification:

Backup file type icon Backup file type

The .undo file extension is probably used by some applications for their backup files (documents, spreadsheets, projects, designs, images, etc.) during some process, so its possible to roll-back the changes.

This undo 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.

Help how to open:

Use compatible tools to work with *.undo files.

How to convert:

As far as we know, this .undo file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

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