Opening a TRE File

The TRE file type is primarily associated with FigTree.

TRE	File extension: TRE
	File type:	tree data file

What is a TRE file?

TRE files mostly belong to FigTree. TRE files hold hierarchical data in a tree structure. They are not a single format but come in different types depending on their use.

Phylogenetic Trees: These files store evolutionary relationships. Software like FigTree opens them. More details are available at this webpage.

Game Data Archives: Some TRE files serve as archives for game data (for example, from Star Wars Galaxies using the BioWare Aurora Engine).

3D Vascular Structures: Certain TRE files contain 3D models of vascular trees. They are used with medical imaging tools like 3D Slicer. See more at 3D Slicer.

Test Export Files: These files can be exports from testing systems such as TestRail. Check out Testomat.io for further info.

Genealogical Files: TRE files sometimes contain family tree data managed by programs like Family Tree Maker. Visit this page for details.

Roofing/Design Files: They are used for storing design models in architectural software from Chief Architect. More at Chief Architect.

Resource Trees: Other TRE files function as resource or data trees in development setups (as seen with TREE.EXE via Resource Hacker).

FilExt.com tip: Each TRE file requires the proper application to display its tree-structured data accurately.

How can I open a TRE file?

You need a suitable software like FigTree to open a TRE 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 TRE file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a TRE file directly in the browser:. Just drag the file onto this browser window and drop it.

Online TRE Text Viewer

Choose your .tre file to analyze

or drag and drop it here

Online File Viewer

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TRE file format details:

To find out what program is needed to open TRE files, you need to determine the file format. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our evaluation of the TRE files looks like this:

The TRE file extension is quite common and has no uniform or dominant file format. But the following two file formats are common:

• 15% of all TRE files are associated with Star Wars Galaxies TRE archive. These are binary files, so they do not contain words or text. A typical file size is 33 MB. The file type was developed 10 years ago and is still in use today. Several words can almost always be found in the files, e.g. EERT5000. A usual file name is data_other_00.tre. Such TRE files store data about patch, data, client, other, aotc, shared and music.
• 10% of all TRE files start with the bytes #NEXUS crucial for this file format. The content consists of readable text data, which can be read using a text editor. The files are 1 KB to 480 KB in size, with a median of 26 KB. Certain words are almost always found in the files, such as #NEXUS, begin taxa;, dimensions ntax, taxlabels and Begin trees;. Such files sometimes refer to tree and nexus.

All the rest of the TRE files (75%) have different formats, frequently e.g. SequoiaView directory Tree, APTR, FamTree, ObjectType and TREE. The category is vascular, network, raxml, clusteringtree, phylogeny or phylogram. Drag & drop your file here to see the file format and a preview of your TRE file!