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File extension Details of HLB, HEX, HM3, HMX, HGL, VFS, ULS, CTG, CHK

Name:HLB
File Type:VMS / VAX Help Library
Popularity:1
Category:misc
File Description:Library of help documentation for a VMS / VAX system
Open Programs: Windows HP OpenVMS
View in a text editor
Name:HEX
File Type:Hexadecimal Source File   (Most common)
Popularity:3
Category:misc
File Description:Contains settings, configuration information, or other data saved in a hexadecimal format; may be stored in either a binary or text format.

NOTE: Binary hex files can only be opened with hex-editing programs; text-based hex files can be opened and edited with a text editor.
Open Programs: Mac OS HexEdit
HexEditor
Windows Heaventools FlexHex
Hex Workshop Hex Editor
Cygnus Hex Editor
HHD Hex Editor
Name:HM3
File Type:Help & Manual 3 Project
Popularity:3
Category:misc
File Description:Windows help documentation created by Help & Manual authoring tool; formatted as RTF files; can be exported to several different formats including Winhelp
Open Programs: Windows EC Software Help and Manual
Name:HMX
File Type:Help & Manual 4 Project
Popularity:3
Category:misc
File Description:Windows help documentation created by Help & Manual authoring tool; formatted as XML files; can be output to HTML Help, Cross-platform Help, PDF, Visual Studio Help, Winhelp, Word documents, e-Books, or Print manuals
Open Programs: Windows EC Software Help and Manual 4 or later
Name:HGL
File Type:HP Graphics Language File
Popularity:3
Category:misc
File Description:Printer control language developed by Hewlett-Packard (often referred to as HPGL); used by plotters from HP and other manufacturers, which print images using lines instead of dots.

Most HGL files contain a few lines of setup commands, followed by a list of printing commands; the printing commands instruct the plotter what to draw on the page.

HPGL files often have a .HPGL extension.
Open Programs: Windows Software Companions ViewCompanion Pro
Corel Paint Shop Pro
Name:VFS
File Type:Virtual File System Index
Popularity:3
Category:misc
File Description:Contains an index of directories and files stored on a hard drive or other media device; may be used to create a virtual file system, which speeds up browsing and searching for files.

NOTE: HP All-in-One printers may add a VFS file to memory cards inserted into the card slot; this happens when the "Faster Browsing" option is turned on; to prevent VFS files from being created on memory cards, press "Setup" on the printer, then select "Preferences," then choose "Enable Faster Browsing" and select "OFF."
Open Programs: Mac OS Used by various hardware devices
Not meant to be opened manually Windows Used by various hardware devices
Not meant to be opened manually
Name:ULS
File Type:NetMeeting User Location Service File
Popularity:3
Category:misc
File Description:Contains information about an Internet location; used by Microsoft NetMeeting to connect users to each other; the Internet Locator Server (ILS) sends a file called "Ulserver.uls" to clients with IP address and port information.

NetMeeting was part of Windows XP, but is not included with Windows Vista; it has been replaced by Windows Meeting Space and Microsoft Office Live Meeting.
Open Programs: Windows Microsoft NetMeeting
Name:CTG
File Type:Canon Digital Camera Catalog File
Popularity:3
Category:misc
File Description:Catalog index file created on Canon digital cameras; stored in the CANONMSC folder and corresponds to other folders saved on the memory card; i.e. "382.CTG" contains information about images in the folder "382CANON."

CTG files contain information about the number of images stored in each folder on the memory card (typically up to 99); they should not be manually opened or edited by the user; the camera will automatically delete the CTG files when the corresponding images are erased.

CTG files are much smaller than .JPG files and do not contain any image data; therefore they cannot be converted to JPEG files.
Open Programs: Mac OS Not meant to be opened Windows Not meant to be opened
Name:CHK
File Type:Saved File Fragment   (Most common)
Popularity:3
Category:misc
File Description:Windows file fragment cleaned from the hard disk by ScanDisk or CHKDISK; stored in the FOUND folder after a disk scan has been performed.

CHK files typically can be deleted since the information has been moved somewhere else on the disk; however, file contents may be checked with CHK-Mate before being removed.
Open Programs: Windows DIY DataRecovery CHK-Mate (examines the contents of CHK files)
UnCHK or FileCHK (recovers data from a CHK file)
Name:CA
File Type:Initial Telnet Cache
Popularity:1
Category:misc
File Description:Stores information used for establishing telnet connections; typically found on Unix/Linux platforms, which include a terminal interface.

The file "named.ca" contains a list of the world's root DNS servers.
Open Programs: Linux Typically should not be opened
May be viewed with a text editor

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