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LHA (file format)
LHA is a freeware compression utility and associated file format. It was created in 1988 by , and originally named LHarc. A complete rewrite of LHarc, tentatively named ''LHx'', was eventually released as ''LH''. It was then renamed to ''LHA'' to avoid conflicting with the then-new MS-DOS 5.0 LH ("load high") command. According to early documentation, LHA is pronounced like ''La''.
Although no longer much used in the West, LHA remains popular in Japan. It was used by id Software to compress installation files for their earlier games, including ''Doom'' and ''Quake''. LHA has been ported to many operating systems, and is still the main archiving format used on the Amiga computer, although it competed with LZX in the mid 90s. This was due to Aminet, the world's largest archive of Amiga related software and files, standardising on Stefan Boberg's implementation of LHA for the Amiga. Microsoft has released a Windows XP add-on, Microsoft Compressed (LZH) Folder Add-on, designed for the Japanese version of the operating system.〔http://support.microsoft.com/kb/896132/JA/〕〔http://www.microsoft.com/globaldev/outreach/dnloads/LZH_add-on.mspx〕 The Japanese version of Windows 7 ships with the LZH folder add-on built-in.〔(You cannot install the Microsoft Compressed (LZH) Folder add-in in Windows 7 )〕 Users of non-Japanese versions of Windows 7 Enterprise and Ultimate can also install the LZH folder add-on by installing the optional Japanese language pack from Windows Update.
==Compression methods==
In an LZH archive, the compression method is stored as a 5-byte text string. These are the third through seventh bytes of the file.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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