File extension Details of UPD, UTF8, CRWL, CHORD, CRD, CYI, RST, RZK, RZN

Name:	UPD
File Type:	Program Update Information
Popularity:	3
Category:	text
File Description:	Text file containing information about a specific program update; often included with a software update installer; similar to a README file or other basic text (.TXT) file.
Open Programs:	Mac OS Any text editor Windows Any text editor

Name:	UTF8
File Type:	Unicode UTF8-Encoded Text
Popularity:	3
Category:	text
File Description:	Text document that uses Unicode UTF-8 (8-bit Unicode Transformation Format) encoding; can be used for English and many other languages, including support for Asian characters; backwards compatible with ASCII
Open Programs:	Mac OS Any text editor or Web browser Windows Any text editor or Web browser

Name:	CRWL
File Type:	Windows Crawl File
Popularity:	3
Category:	text
File Description:	Log file generated after an indexing process run by Windows Search, Microsoft Exchange, or SharePoint Portal Server; contains data about the files that were "crawled" during the indexing process; typically saved along with a corresponding .GTHR file.
Open Programs:	Windows View in a text editor

Name:	CHORD
File Type:	Song Chords File
Popularity:	3
Category:	text
File Description:	Text file containing song lyrics and chords, also known as guitar tabs; often formatted as a plain text file, but uses the .chord extension to indicate the file contains guitar chords; may also use the .CRD extension.
Open Programs:	Mac OS Any text editor Windows Any text editor

Name:	CRD
File Type:	Guitar Tabs   (Most common)
Popularity:	3
Category:	text
File Description:	Includes song lyrics with matching guitar chords and tabs
Open Programs:	Mac OS Any text editor Windows Any text editor

Name:	CYI
File Type:	Clustify Input File
Popularity:	3
Category:	text
File Description:	Text-based input file used by Clustify, a document organization program; specifies a list of documents to cluster (which identifies and arranges similar documents).
Open Programs:	Windows Hot Neuron Clustify Linux Hot Neuron Clustify

Name:	RST
File Type:	reStructuredText File
Popularity:	3
Category:	text
File Description:	Text file that contains code written in the reStructuredText markup language; can apply basic styles and formatting to text documents; used for in-line program documentation (primarily for Python), and for creating standalone documents and simple Web pages.
Open Programs:	Mac OS RSTTool Edit with a text editor Windows RSTTool rst2a JRst Edit with a text editor Linux RSTTool

Name:	RZK
File Type:	File Crypt Password File   (Most common)
Popularity:	3
Category:	text
File Description:	Contains password information for .RZX files encrypted with File Crypt (also known as Kriptirnik and Akte Krypta); created by File Crypt, but can be opened and edited with a text editor.
Open Programs:	Windows Red Zion File Crypt Any text editor

Name:	RZN
File Type:	Red Zion Notes File
Popularity:	3
Category:	text
File Description:	Notes file used by the Slovenian software program, Red Zion E-book (also known as "Red Zion E-knjiga"); saved in a text format that can be opened and edited by the user. Red Zion eBooks use the .RZB extension.
Open Programs:	Windows Red Zion E-book

Name:	RAD
File Type:	Radar ViewPoint Radar Data
Popularity:	3
Category:	text
File Description:	Radar data analysis format used for locating aircraft and monitoring airspace
Open Programs:	Windows Radar ViewPoint