There[SQ]s no known widely used or publicly available software called "Withdata BigTextFileViewer" for Windows (or any other operating system). It[SQ]s possible :

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It[SQ]s a very niche or internal tool:

The software might be developed and used within a specific company or organization and not publicly distributed.
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The name is slightly different:

There might be a minor misspelling in the name, or a similar-sounding program exists.
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It doesn[SQ]t exist:

The name might be entirely fabricated.

If you encountered this name in a specific context (e.g., a document, a website), providing more details would help determine what it might refer to.