All about TREES Files

The TREES file type is primarily associated with Mesquite, PAUP*.

TREES	File extension: TREES
	File type:	Storing phylogenetic trees

What is a TREES file

TREES files mostly belong to Mesquite, PAUP*. A *.TREES file stores phylogenetic trees, which represent the evolutionary relationships among a set of organisms or other entities. These files are commonly used in phylogenetic analysis software to save and exchange tree data. The internal format can vary, but they often contain information about the tree topology (branching pattern), branch lengths (representing evolutionary distance or time), and support values (indicating the confidence in the relationships). Newick format is a common standard for representing phylogenetic trees in text files, and many *.TREES files use this or a similar format. The files may also include metadata such as the names of the taxa (the entities in the tree) and other annotations.

How can I open a TREES file?

You need a suitable software like Mesquite, PAUP* to open a TREES file. You need a suitable software like Mesquite, PAUP* to open a TREES file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your TREES file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a TREES file directly in the browser:. Just drag the file onto this browser window and drop it.

Online TREES Text Viewer

Choose your .trees file to analyze

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Online File Viewer

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What to Do When a .TREES File Fails to Open

TREES files can originate from various specialized programs and aren't universally openable.

Identify the Source: Files received from bioinformatics researchers or evolutionary biology workflows often contain phylogenetic tree data.
Check the Header: Open the file in a text editor or hex viewer to inspect the first lines.
- #NEXUS indicates a standard phylogenetic text format.
- Readable XML/JSON suggests structured metadata.
- "PK" means it may be a compressed ZIP archive.
Use the Original Software: You usually need the specific program that created it, such as Mesquite or PAUP*. If uncertain, ask the sender.
Use this Webpage: Drag and drop your .TREES file into our viewer to detect the format, extract readable text/metadata, and preview when possible.

Technical Data for TREES File Extension

File classification:

Bioinformatics, Phylogenetics, Evolutionary Biology

Related files:

tree

a trees Storing phylogenetic tree is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with TREES files

Associate the TREES file extension with the correct application.
Update your software that should actually open storing phylogenetic trees. Because only the current version supports the latest TREES file format. Search, therefore, e.g. on the manufacturer website after an available Mesquite, PAUP* update.
To make sure that your TREES file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .TREES file online - secure, fast, and no downloads needed.