CTE File

What are CTE files and how to open them

Are you having problems opening a CTE file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CTE files.

What is a CTE file?

A .CTE file is a Classical Text Editor Document file.

Classical Text Editor Document files are native project documents created by the Classical Text Editor, a specialized word-processor by Stefan Hagel for producing scholarly editions of texts with apparatus criticus, notes, parallel texts, translations, sigla, and bidirectional writing such as Greek or Hebrew. These files are used during the editing process - inputting variants, footnotes, source sigla, layout, and XML tags - and serve as the basis for exporting final text in formats like print, PDF, RTF, or TEI/XML.

The Classical Text Editor writes these documents; scholars interact with them by editing in the GUI of the program. Features include defining multiple apparatus (critical and other types), assigning notes, managing sigla of sources, applying tags for XML export, and formatting for print or PDF. Publishing workflows typically involve exporting from the document file to TEI-compliant XML for digital editions or to print-friendly formats via PDF or RTF.

These documents are in a proprietary internal format: the internal structure is not defined by a public standard in the same way TEI/XML is, although Classical Text Editor offers XML export following TEI guidelines. The format has no widely documented fixed magic byte signature.

How to open CTE files

Important: Different programs may use files with the CTE file extension for different purposes, so unless you are sure which format your CTE file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested four different CTE openers which you will find listed below.

Last updated: September 19, 2026

Various apps that use files with this extension

These apps are known to open certain types of CTE files. Remember, different programs may use CTE files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CTE file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.