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.CDT file extension

To open .CDT files on Windows, install and open CorelDRAW, then use File → Open and select the .CDT file (or double-click the file if CorelDRAW is already associated).

To open a .CDT file, use CorelDRAW (it is a CorelDRAW Template). If your device doesn’t have CorelDRAW, transfer the file to a desktop with CorelDRAW installed or ask the sender to export to a more common format (e.g., PDF) from CorelDRAW.

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Last updated: April 29, 2026 · Reviewed by Julian Stricker

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .CDT files

Use these platform-specific instructions to open .CDT files safely.

Windows

  1. Install and open CorelDRAW, then use File → Open and select the .CDT file (or double-click the file if CorelDRAW is already associated).
  2. If Windows asks for an app, choose CorelDRAW (look for CorelDRAW in “More apps”).
  3. If you only need to view/share, ask the sender to export it from CorelDRAW to a common format (such as PDF) and send that instead.
Full Windows guide

Mac

  1. If you do not have CorelDRAW available on your Mac, transfer the .CDT to a Windows PC with CorelDRAW installed to open it.
  2. Ask the creator to export from CorelDRAW to a standard format (such as PDF) for viewing on macOS.
Full Mac guide

Linux

  1. Try opening the file from your file manager; your desktop may label it with the MIME type image/x-coreldrawtemplate based on shared MIME mappings.
  2. If you don’t have a compatible CorelDRAW workflow on Linux, move the file to a system with CorelDRAW to open/edit it, or request a PDF export.
Full Linux guide

iOS

  1. iOS typically won’t open .CDT directly; request a PDF export from CorelDRAW or open it on a desktop with CorelDRAW.
Full iOS guide

Android

  1. Android typically won’t open .CDT directly; request a PDF export from CorelDRAW or open it on a desktop with CorelDRAW.
Full Android guide

Security notes

  • Treat .CDT files as untrusted input when they come from unknown sources: even though it’s a template, opening it requires a complex graphics parser, and malformed files can trigger application vulnerabilities.
  • Be cautious with templates received by email or downloaded from the web: templates can contain embedded content (for example, linked/embedded assets) that may load or prompt for resources when opened in a design application.
  • If you only need to view the content, prefer receiving a PDF export from the author instead of opening the original .CDT template.

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Can't open this file?

These are the most common causes and fixes when .CDT files fail to open.

Common reasons

  • Windows says it can’t open the .CDT file
  • Wrong program opens the file (or it opens as “unknown image/x-coreldrawtemplate” on Linux)
  • The file opens but looks incomplete or errors out

Fix steps

  1. Install CorelDRAW, then open the file from within CorelDRAW (File → Open).
  2. Right-click the file → Open with → Choose another app → select CorelDRAW and optionally set it as the default for .cdt.

OS-specific troubleshooting

What is a .CDT file?

.CDT is a CorelDRAW Template format in the CorelDRAW file-format family. Templates are used as starting points for new documents, often containing preset layout, styles, and reusable elements. On some Linux systems, .cdt may be mapped via shared-mime-info-style databases to image/x-coreldrawtemplate.

Background

In practice, a .CDT file is used in CorelDRAW workflows to standardize designs—such as consistent page sizes, color palettes, and brand elements—so new documents can be created from a controlled starting point.

CorelDRAW is the primary application associated with .CDT, and official Corel documentation lists CDT among CorelDRAW-related supported file types. Reference sites that catalog extensions also describe .CDT as a CorelDRAW template.

On Linux and other desktop environments that use the freedesktop.org shared MIME-info ecosystem, file associations are often driven by MIME mappings. Some distributions include a mapping that associates .cdt with image/x-coreldrawtemplate, which can influence which apps are suggested when you use “Open With.”

Common MIME types: image/x-coreldrawtemplate

Further reading

Authoritative resources for more details on the .CDT format.

Common .CDT issues

Windows says it can’t open the .CDT file

This usually happens when CorelDRAW (the expected application for CorelDRAW templates) is not installed or not associated with the .cdt extension.

  1. Install CorelDRAW, then open the file from within CorelDRAW (File → Open).
  2. Right-click the file → Open with → Choose another app → select CorelDRAW and optionally set it as the default for .cdt.

Wrong program opens the file (or it opens as “unknown image/x-coreldrawtemplate” on Linux)

Desktop environments rely on file associations; some systems map .cdt to image/x-coreldrawtemplate, but you may not have an app installed that can use that type.

  1. Use “Open With” and select the correct application if available; otherwise, open the file on a system with CorelDRAW installed.
  2. If you only need viewing, request an exported PDF from the file’s author.

The file opens but looks incomplete or errors out

The template may be corrupted, partially downloaded, or created in a way your setup can’t handle reliably.

  1. Re-download or re-copy the .CDT file and try opening again in CorelDRAW.
  2. Ask the sender to export the design to PDF from CorelDRAW to verify the content is intact.

FAQ

Is a .CDT file an image?

Despite some MIME mappings using an image/* type (e.g., image/x-coreldrawtemplate), .CDT is best understood as a CorelDRAW template used to create new CorelDRAW documents, not a standard raster image like PNG or JPG.

What program opens .CDT files?

CorelDRAW is the primary application associated with .CDT (CorelDRAW Template).

Can I convert a .CDT by renaming it to .CDR or .PDF?

No. Renaming only changes the extension; it doesn’t convert the file. Use CorelDRAW to open the template and export to a format like PDF if needed.

Why does Linux call my file image/x-coreldrawtemplate?

Some systems use freedesktop.org-style MIME databases and may include a mapping from .cdt to image/x-coreldrawtemplate, which affects file associations and “Open With” suggestions.

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