Kinds of UCN Files

Principal UCN Type

.UCN

File Name:	.ucn
Category:	UltraCompressor II Compressed Archive

A UCN file is a compressed archive file created by the program UltraCompressor II.

Organization:	Nico De Vries
Function:	Compressed Files
Subkey:	HKEY_CLASSES_ROOT\.ucn

Software Programs That Open The UltraCompressor II Compressed Archive:

UltraCompressor II by Nico De Vries

Windows

OS/2

MS-DOS

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Sources of UCN Problems

Common Problems Opening UCN Files

UltraCompressor II Removed

You encounter an error message such as "%%os%% Can't Open UCN Files" when trying to open your UCN. Usually, this is because you do not have UltraCompressor II for %%os%% installed. Your operating system cannot associate your UCN with UltraCompressor II, so double-clicking the file won't work.

Tip: If you have another software that you know opens UCN files, you can select it by hitting the "Show Apps" button.

Wrong Version of UltraCompressor II is Installed

Occasionally, you might have an outdated version of UltraCompressor II installed that's incompatible with your UltraCompressor II Compressed Archive type. If you've got the wrong version of UltraCompressor II installed, you'll need to install the correct version. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

Tip: You can sometimes get hints about the right program version by right-clicking on the UCN file, selecting "Properties", and looking at the version information.

Conclusion: The majority of UCN file opening issues are due to not having the correct UltraCompressor II version installed.

Additional UCN Opening Issues

Although you might already have UltraCompressor II or another UCN-associated software installed on your computer, you can still encounter problems opening UltraCompressor II Compressed Archive files. If you are continuing to have errors with loading UCN files, other external issues might be to blame. These issues include:

• Invalid UCN file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• The UCN file description within the Windows Registry was removed
• Defective install of a UCN program, such as UltraCompressor II
• Your UCN file is corrupted (issues with your UltraCompressor II Compressed Archive file itself)
• Malware-tainted UCN file can't be opened
• UCN-related hardware has device drivers that obsolete
• Your PC doesn’t have enough available resources to open the UltraCompressor II Compressed Archive file