CYDWR File

What are CYDWR files and how to open them

Are you having problems opening a CYDWR 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 CYDWR files.

What is a CYDWR file?

A .CYDWR file is a Cypress PSoC Design-Wide Resource file.

Cypress PSoC Design-Wide Resource files store central configuration settings for PSoC Creator projects. They are created by the PSoC Creator IDE whenever a new design project is started. These files consolidate project-level resource assignments such as which microcontroller pins are used, how clocks are configured, interrupts mapped, system parameters set, flash security and other directives, so that the designer has one place to manage them.

The file is read and edited by PSoC Creator during design entry. It is used during the build process to generate generated source code and drive tooling like the fitter, clock configuration, peripheral allocation, and other hardware resources. If this file is deleted, the design reverts to default settings for all design-wide resources.

The file is formatted in XML under the root element DesignWideResources with namespace identifiers such as http://cypress.com/xsd/cydwr. Key sections include groups for pins, clocks, interrupts, system settings, directives, flash security, etc. Internal identifiers include a "DWRInstGuidMapping" group that maps components to GUIDs.

Below is a sample of XML content from such files (signature is XML declaration and root-element with namespace); internal elements like <Group key="Component">, <Data key="DataVersionKey">, <Group key="DWRInstGuidMapping"> appear in the header portion.

How to open CYDWR files

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

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: September 21, 2026

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