File extension is usually three or more characters at the end of the computer file name. File extensions are useful for computer operating systems, like Microsoft Windows or Apple MAC OS X, and basicaly tell them, what kind of data file it is and with which application associated it is.
We have collected a huge amount of informations and created searchable file extension list. At present the File-Extensions.org library contains thousands of file extensions and with each day the database is growing. A large number of file type entries have detailed descriptions, including their current use and a list of applications associated with it and which can handle the unknown file type, you were searching for.
If you encounter a file in your computer with an unknown file extension, then you are at the right place. You can check our database for informations about file extension you were looking for, including list of associated applications.
Simply use the search box at the top-left corner of each page to check our database for a specific file extension. You may also browse our database in alphabetical order using the navigation menu at the top.
File extension of the day:
Random daily pick from file-extensions.org database.
.nco - Nero BackItUp compressed backup file
File extension nco is a compressed backup file created by Nero BackItUp application and contains data to be backed up to a CD or DVD. Nero BackItUp is a part of NERO suite.
Associated application: Nero Multimedia Suite
Help how to open: Open with Nero BackItUp and use restore command, you should get a default "Save as..." dialog box from which you can save the files with their normal extension and uncompressed.
Help how to convert this file type: A .nco file is just a .zip file under Nero's proprietary extension. Rename the extension and you will be able to open and extract the archive using any program that can open .zip files.
Help how to backup this file type: not available
Database contains 1 records with the same file extension name.
Last update on June 29, 2010.
Recently updated file extensions:
Existing and new file extensions are updated or added very often.
file extension mpqe - Starcraft 2 encrypted game data file
file extension thmx - Microsoft PowerPoint 2007 theme file - template
file extension jar - Compressed archive file package for Java classes and data
file extension mpq - Blizzard Entertainment archive file
file extension mdf - Alcohol 120% disc image file format
file extension snp - Microsoft Access Shapshot file (Snapview)
file extension zix - WinZix compressed archive file
file extension 3 - IBM Embedded ViaVoice voice type languages scripts data file format
file extension ocx - ActiveX control file
file extension fbl - iGO map file
file extension csh - Adobe Photoshop shapes
file extension w02 - Temp file
file extension zip - ObjectBar theme pack file format
file extension dta - Data file
file extension accde - Microsoft Access 2007 or Access 2010 files that are in execute only mode
file extension ssf - Epson QUASS Stream Player file
file extension cxb - Custody X Change data file
file extension cxb - ComicGuru file
file extension accdr - Microsoft Access 2007 or Access 2010 file that enables you to open a database in runtime mode
file extension accdt - Access Database templates
file extension accdb - Microsoft Access 2007 or Access 2010 database file format
file extension cap - Capture file
file extension xlsx - Excel 2007 or Excel 2010 XML Workbook
file extension xls - Microsoft Office Excel spreadsheet
file extension xsd - XML schema description file
file extension mdx - Microsoft database index
file extension key - iWork Keynote presentation file
file extension sis - Symbian installation file
file extension msg - Microsoft Exchange mail document
file extension max - 3D Studio MAX scene file
file extension cpt - Corel PHOTO-PAINT bitmap file
file extension m3u8 - The unicode version of m3u playlist file
file extension flac - Audio files encoded by Flac - free lossless audio codec
file extension sym - Program symbol table
file extension sat - 3D ACIS model file
file extension abm - Album file
file extension fax - Fax file (generic Group 3 1bit encoded data)
file extension pdb - Palmpilot database file
file extension prt - SolidWorks Part file
file extension plt - Palette file
file extension es - Spanish language translation file
file extension pf - Monitor or printer profile file
file extension cdx - Compound index file
file extension shp - 3D graphic image format
file extension snf - Sniffer capture file
file extension fil - File list
file extension ply - Polygon format
file extension iff - Bitmap image
file extension de - German language translation file
file extension swe - Sweden localization language file
file extension viff - Smart Pix image file
file extension pkg - Apple Newton file
file extension hqx - BinHex archive format, orig. Macintosh
file extension wtf - World of Warcraft server configuration file
file extension torrent - BitTorrent information file
file extension 005 - Compressed file from a multi-volume archive (part 5)
file extension ps - Adobe PostScript file
file extension mso - Microsoft Organization chart file
file extension 3ds - Autodesk 3D Studio 3D scene (Mesh)
file extension jsp - JAVA Server page
file extension ldb - Microsoft Access Record-Locking Information file format
file extension dat - Generally text or binary datafile
file extension msu - Windows Vista hot fix installer package file
file extension tmp - Temporary file
file extension vvf - Camera video format
file extension pst - Microsoft Office Outlook personal folder file
file extension tpl - PHP template file format
file extension pf - Windows prefetch file
file extension axd - ASP.NET web handler
file extension dae - Collada 3D Digital Asset file
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For an overview of common file types,
visit the common file extensions page, which includes a list of the most important computer file formats you should know.
For an overview of unknown file extension,
visit the unknown file extensions page, which includes a list of the unknown file formats. If you know function of any unknown extension, please click on Submit button at the top of page and contact us.
Unhide file extensions in your Windows operating system
By default, the file extensions in Windows operating systems, are hidden. What you can't see and have no idea about, can be for your computer very harmful one day. This can allow virus and other malicious software programmers to distribute executable files disguised as something non-executable. For example, an .exe file may, with hidden file extensions, appear as common text file with name like file-name.txt[.exe], where the true .exe extension is to the user not visible.
There have been a large number of malicious programs or viruses exploiting this default setting of Windows operating systems, which is hiding file extensions from the user. This "feature" can be used to fool users into executing malicious or damaging code by making a file appear to be something it is not.
Multiple email-borne viruses are known to exploit the fact that Microsoft Windows operating systems hide certain file extensions. The first major attack incorporating an element of file extension obfuscation was the VBS/LoveLetter worm. ILOVEYOU or LOVELETTER is a computer worm that successfully attacked tens of millions of Windows computers in 2000. The worm contained an email attachment named "LOVE-LETTER-FOR-YOU.TXT.vbs". The vbs extension was hidden by default, which caused that many users just opened it, thinking it was a common text file. Other malicious programs and viruses have ever since incorporated similar naming schemes.
For very those reasons we believe, that hidding file extensions by default, is wrong decision by Microsoft, yet they are still hidden in the new Windows 7. For more informations about executable files, please visit the program executable files section.
Most popular file extension list:
List of the file extensions you should know.
file extension torrent - BitTorrent information file
file extension aspx - ASP.NET script, page
file extension rar - WinRAR compressed archive
file extension 002 - Compressed file from a multi-volume archive (part 2)
file extension flac - Audio files encoded by Flac - free lossless audio codec
file extension uccapilog - Microsoft Windows Live Messenger UCC API log file
file extension cbr - Comic Book Archive file or ComicBook Reader File
file extension part - Partial download file
file extension srt - Movie subtitle file format (SubRip format)
file extension xls - Microsoft Office Excel spreadsheet
file extension xlsx - Excel 2007 or Excel 2010 XML Workbook
file extension pages - iWork Pages document file
file extension nrg - Nero-Burning ROM CD or DVD image file
file extension dlc - JDownloader download link container
file extension pub - Microsoft Publisher document
file extension bin - Binary file
file extension wps - Microsoft Works document
file extension themepack - Microsoft Windows 7 theme pack file
file extension djvu - DjVu file bitmap image
file extension odt - OpenOffice.org Writer text document
file extension m2 - World of Warcraft model object file format
file extension gadget - Windows sidebar gadget file
file extension z01 - Split Multi-volume ZIP compressed file archive (part 2)
file extension dwg - AutoCAD Drawing Database file
file extension vmdk - VMware virtual disk file
file extension menc - Microsoft Windows Mobile encrypted file
file extension 7z - 7-ZIP compressed 7z archive file
file extension mp4 - MPEG-4 video file format
file extension dt2 - Microsoft Live Messenger file
file extension uif - MagicISO Universal Image Format - UIF file
file extension cdr - CorelDRAW vector image
file extension pps - Microsoft PowerPoint slideshow
file extension 003 - Compressed file from a multi-volume archive (part 3)
file extension m4v - MPEG-4 video file format
file extension json - Mozilla Firefox bookmark backup file