Known ULW Files

Primary ULW File Association

.ULW

File Format:	.ulw
Type:	U-Law Audio File

An audio format associated with US telephony applications. The file stores raw CCITT G.711 u-law audio data that has not been compressed or encoded.

Company:	NCH Software
Function:	Audio Files
Folder:	HKEY_CLASSES_ROOT\.ulw

Software Programs That Open The U-Law Audio File:

NCH Switch by NCH Software

Windows

Mac

FMJ-Software Awave Audio by FMJ-Software

Windows

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Understanding ULW Issues

Issues Opening ULW Files

NCH Switch Isn't There

If you attempt to load your ULW file, you experience a message such as "Can't Open ULW Files". If so, it typically means that you don't have NCH Switch installed for %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: If you know of another program that can open your ULW file, you can try opening it by selecting the application from the programs listed.

Outdated NCH Switch

In some cases, you might have a newer (or older) version of a U-Law Audio File file that is unsupported by your installed application version. Visit the NCH Software website to download (or purchase) the latest version of NCH Switch. This issue mainly occurs when your U-Law Audio File file was created by a newer version of NCH Switch than you have on your PC.

Tip: Find clues on the correct software version by right-clicking your ULW file and clicking "Properties".

Primarily, problems experienced when opening ULW files are due to having the incorrect version of NCH Switch installed on your computer.

Additional ULW Opening Issues

Assuming you have the right NCH Switch version installed, other problems can prevent you from opening ULW files. Other ULW opening errors can be created by other system problems inside of %%os%%. These other problems include (listed in order from most to least common):

• ULW file references in the Windows Registry are broken
• Accidental deletion of the description of the ULW file in the Windows registry
• NCH Switch or another ULW application experienced a flawed installation
• The ULW itself is corrupted
• The ULW is infected with a virus
• Hardware related to ULWs has device driver corruption
• Windows cannot load your U-Law Audio File file due to insufficient resources (eg. RAM)