Opening CPX Files

The CPX file type is primarily associated with UPX.

CPX	File extension: CPX
	File type:	compressed data container

What is a CPX file?

CPX files mostly belong to UPX. CPX files do not have a single, fixed role. Their function depends on the context in which they were created. For example, one common type is a compressed EGA font file used by UPX to store font data in a smaller, efficient format.
Other uses include:

Zipped Physiotherapy Data: In some cases the CPX file is a ZIP archive containing physiotherapy data.

Age of Empires Campaign File: Here the file holds scenario information for game campaigns. More details are available at Age of Empires.

Code Page Translation File: This version stores translation or mapping data, sometimes linked with Oracle products.

FilExt.com notes: If you need to view or edit a CPX file, first check its origin. Use an archive tool (like 7-Zip) if it is a ZIP-based file, a game editor for campaign files, or a specialized font/decompression tool if it’s a compressed EGA font. For UPX font files, further info is on UPX.

How can I open a CPX file?

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

Online CPX Text Viewer

Choose your .cpx file to analyze

or drag and drop it here

Online File Viewer

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CPX file format:

The file format, which is the arrangement and type of data in a file, determines which program can open the file. 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. File extension, signature and file format must match; otherwise errors will occur when the file is opened. Knowledge is power - this also applies when dealing with unknown or faulty files. Our examination of the CPX files comes to the following conclusion:

CPX is rarely used as a file extension and includes different formats for different programs. The file formats most commonly found in CPX files are:

• 30% of all CPX files belong to FreeDOS Code Page Information. These are binary files, so they do not contain words or text. Most of these files are 4 KB to 7 KB in size. The files contain the following words: FONT, UPX!, <fBBf and BBf<. An example of a file name is ega.cpx or ega2.cpx.
• 15% of all CPX files use the ZIP format, i.e. a CPX file contains several compressed files. The average file count is 11 with most CPX files containing between 2 - 12 compressed files. Tip: If you rename the file ending to .zip and then double-click it, you see the included files and images. The files are often between 170 KB and 6 MB in size. A usual file name is CG01_20180601.cpx or CB01_20180601.cpx.

All other CPX files (55%) have no consistent format, often e.g. Windows Codepage translator and CorelDraw compressed format. They are often associated with xcam. If you want to find out which format your CPX file belongs to, just click on the button "Choose your .cpx file to analyze".