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filet
filet crochet
filet mignon
filial
filiate
filiation
filibeg
filibuster
filicide
filiform
filigree
filing (1)
filing (2)
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filing clerk
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file extension
file ex·ten·sion (plural file ex·ten·sions)


noun 
Definition:
 
computer file's identifying letters: a set of characters following the period after the name of a DOS file, identifying the file type
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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