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File extension	.chm
Category	eBook File
Description	The CHM file format was developed by Microsoft and first released along with Windows 98 and the format continues to be supported. This file format superseded WinHelp. CHM files grew in popularity due to the fact that they are fully compatible with a web browser which can be found on all computers. The vulnerability of this file type has been highlighted widely due to the ability for certain controls to be executed by the file.
Actions	CHM Converter View other eBook file formats
Technical Details	A .chm file comprises of a number of HTML pages and an Index. The format supports 28 different language types. The file provides functionality such as compression, merge and search. Just like a HTML page, the file can be composed of a variety of tags and images to enrich the content of the help files.
Associated programs	Microsoft Reader Beyond CHM Mozilla Firefox Internet Explorer
Developed by	Microsoft
MIME type	application/vnd.ms-htmlhelp
Useful links	More Information on CHM Technical Release Information on CHM EPUB to PDF

File extension	.txt
Category	Document File
Description	The .txt file extension is one of the most ubiquitous file types. The file generally consists of plain text only and contains no formatting. Almost any application that can handle text can open a .txt file. As a result this format remains popular due to its support across all platforms and Operating Systems. The file type is one of the oldest file types in existence with its origins tracing back to the first computers.
Actions	TXT Converter View other document file formats
Technical Details	A .txt file normally uses a basic character set which contains letters, numbers and symbols. A typical example of this would be the ASCII character set. The main alternative to ASCII is Unicode. Unicode is a rival format for text files. A plain text file should only contain several non-printable charaters such as new lines, tab and form feed.
Associated programs	Notepad WordPad TextEdit
Developed by	Various
MIME type	text/plain application/txt browser/internal text/anytext widetext/plain widetext/paragraph
Useful links	More information on text files Comparison between plain text and formatted text

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