What does X mean in File Extensions?

This page is about the meanings of the acronym/abbreviation/shorthand X in the Computing field in general and in the File Extensions terminology in particular.

X-file Animation ( Direct3D) ( DeepV2)

Computing » File Extensions


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What does X mean?

ten, 10, X, tenner, decade(noun)
the cardinal number that is the sum of nine and one; the base of the decimal system

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"X." Abbreviations.com. STANDS4 LLC, 2015. Web. 5 Oct. 2015. <http://www.abbreviations.com/term/43141>.