All about UCD Files

The UCD file type is primarily associated with 7-Zip.

UCD	File extension: UCD
	File type:	multi-format container

What is a UCD file?

UCD files mostly belong to 7-Zip. UCD files do not have a single purpose. They are used in several specialized ways:

GZIP-compressed data: Some UCD files store user-created data, often related to design projects such as MicroStation design files. Use a decompression tool (for example, 7-Zip) to extract the contents.

XML-based diagrams: Other UCD files hold a unified Class Diagram (a type of UML diagram) created by tools like UCT/5 or Modelio. Opening these in an XML or UML editor will reveal the file structure.

ZIP-coded projects: A number of UCD files are mBot coding files for microcontroller projects. They are packaged as ZIP archives and can be opened with a zip utility. The mBlock coding environment (mBlock official site) is used for editing these projects.

Control and drawing files: Some files are labeled as Urban Control Data or MicroCad drawing files and are meant for specialized CAD viewers.

Executable content: A few UCD files are actually Windows executables produced by PowerBuilder. These act as legacy driver files for older Windows systems. More details are available on the PowerBuilder webpage.

FilExt.com note: To decide how to open your UCD file, check its content: a text editor can show XML tags or file signatures (like those of GZIP or ZIP). The internal format determines the proper application to use.

How to open UCD files

You need a suitable software like 7-Zip to open a UCD 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 UCD file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a UCD file directly in the browser:. Just drag the file onto this browser window and drop it.

Online UCD Text Viewer

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UCD file format:

Every file has a defined file format, i.e. how the data is arranged in the file. The file format can be determined based on the file extension and the signature (the first few characters of a file). If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. So you need a detailed analysis of a file to find out the format and the associated program. Below is our analysis of the UCD files:

UCD is not a common file extension and includes different formats for the applicable programs. However, the following two file formats are common:

• 25% of all UCD files save the data in XML file format. The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, webpages, data, configuration, books, transactions, invoices, and much more. XML defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The contents of these files can even be read by a human. The files are often between 400 bytes and 41 KB in size. Certain words are almost always found in the files, such as <?xml version="1.0" encoding="UTF-8"?> and <editmodel:ClassDiagramEditModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:editmodel="edi.
• 25% of all UCD files use the popular GZIP file format. Gzip is a compressed archive file format. Gzip (GNU zip) is only capable of compressing a single file. If you open these files in a text editor, you will see only illegible characters. The average file size is 54 KB with most files being between 810 bytes and 640 KB in size.

All the rest of the UCD files (50%) have different formats, the following 5 formats can be found: ZIP, EXE and Ucadw. They are often associated with configuration, export, code or user. If you want to find out what your UCD file contains, drag and drop it onto this page.