Opening a CO$ File

The CO$ file type is primarily associated with MS Compressed COM.

CO$	File extension: CO$
	File type:	Decompress with UNPACK.EXE.

What is a CO$ file?

CO$ files mostly belong to MS Compressed COM. Use our "Online CO$ Text Viewer" below to analyze your CO$ file and to see all text it contains.

How to open CO$ files

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

Online CO$ Text Viewer

Choose your .co$ file to analyze

or drag and drop it here

Online File Viewer

✈

Read our privacy guarantee in Filext’s terms and privacy policy

Please allow ads on our site

This helps us keep our servers running. Then re-upload your file to view it.

Click here to see how to disable the ad blocker for filext.com

.CO$ File Not Opening? How to Fix It:

CO$ files can originate from various legacy systems and aren't universally openable.

Identify the Source: These are often found in old MS-DOS installation disks or legacy software archives, indicating they are compressed .COM executables.
Check the Header: Open the file in a hex editor to inspect its first bytes:
- SZDD or KWAJ indicates a standard Microsoft compressed file.
- MZ suggests an uncompressed DOS executable.
Use the Original Software: The original utility is usually required; try using Microsoft's legacy UNPACK.EXE, EXPAND.EXE, or 7-Zip, or ask the sender if uncertain.
Use this Webpage: Drag and drop your file onto this page to detect its format, extract readable text, and preview its contents.

Technical Data for CO$ File Extension

Related files:

bi$, ba$

a co$ Decompress with UNPACK.EXE. is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CO$ files

Associate the CO$ file extension with the correct application.
Update your software that should actually open decompress with unpack.exe.s. Because only the current version supports the latest CO$ file format. Search, therefore, e.g. on the manufacturer website after an available MS Compressed COM update.
To make sure that your CO$ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CO$ file online - secure, fast, and no downloads needed.