PCO file format description

Many people share .pco files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .pco file can be edited, converted or printed with. On this page, we try to provide assistance for handling .pco files.

2 filename extension(s) found in our database.

.pco - PC-Outline Outline

The PCO document files are related to PC-Outline. The PCO file is a PC-Outline Outline. PC-Outline is a DOS-based outline processor for mapping out ideas, organizing them and printing them out in a logical way. The PC-Outline seems to be no longer supported.

Document files
- / -
PC-Outline Outline related extensions:
PI Expert Document
MetaStock Document
SharkCAD Drawing
Nero UDF/ISO CD-Rom Compilation
Lightweight Markup Language Text
Medical Reality Modeling Language File

.pco - PComposer Notation Project

The PCO project files are related to PComposer. The PCO file is a PComposer Notation Project. PComposer is a music notation software. The PComposer seems to be no longer supported.

Project files
- / -
PComposer Notation Project related extensions:
Flash Intro Builder Project
CreataCard Quick Prints Project
AutoREALM Project
Rosegarden Project Package
Multimedia Builder Project
Nvidia FX Composer Project

Naturally, other applications may also use the .pco file extension. Even harmful programs can create .pco files. Be especially cautious with .pco files coming from an unknown source!

Can't open a .pco file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .pco file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

co, cpo, lco, oco, pc, pci, pck, pcl, pcp, pdo, pfo, po, poc, pso, pvo

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Patch Creation Properties File
SWAT Precipitation Input Data
Perfect World Package
PocoMail PocoScript
Microsoft SMS Package
Codesoft Printer Object Configuration

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.


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DataTypes.net >> PCO file