.JPN File Extension
Windows Japanese Noise-Word List File
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What is a JPN file?
System file used by Index Server, a search indexing service included with the Windows operating system; contains a list of English and Japanese words that are excluded from Windows search; enables Windows to create search information more effectively, since words such as "of," "the," and "it" are excluded from the index.
A JPN file named noise.jpn is located in the C:\Windows\System32\ directory. In addition to English noise words, it also contains Japanese noise words such as あ, which means "there."