[FEATURE] Add HWPX (Korean word processor) file preview support in Claude.ai

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• [x] This is a single feature request (not multiple features)

Problem Statement

Claude.ai's file preview panel (right-side artifact viewer) currently supports HTML, Markdown, PDF, SVG, and React (.jsx) files, but does not support HWPX files — the standard document format for South Korea.

HWPX (.hwpx) is:

• The Korean national standard document format (KS X 6101, OWPML)
• The default file format of Hancom Office (한컴오피스), used by virtually all Korean government agencies, public institutions, schools, and many businesses
• Mandated by the Korean government for all official documents since 2021
• Structurally a ZIP archive containing XML files — technically very similar to DOCX/XLSX

Claude already has the capability to generate HWPX files programmatically (via custom skills using Python's standard library), but users cannot preview the generated files within Claude.ai. They must download and open them in a separate application, which breaks the workflow continuity.

Proposed Solution

Add HWPX file preview support to Claude.ai's right-side panel, similar to how PDF and HTML files are rendered.

Since HWPX is essentially ZIP + XML (similar to OOXML), a lightweight renderer could:

1. Extract the XML content from the ZIP archive
2. Parse section0.xml (main body content)
3. Render text, tables, and images as HTML for preview

Even a basic text-only preview would be a significant improvement over no preview at all.

Why This Matters

• South Korea is a key market for Anthropic — Korean users are among the most active Claude users globally
• 100% of Korean government documents use HWP/HWPX format
• Claude can generate HWPX but can't preview it — this creates a broken user experience
• No other AI platform offers HWPX preview either — this would be a competitive differentiator
• The technical implementation is feasible since HWPX uses open XML standards (unlike the legacy binary HWP format)

Additional Context

The HWPX format specification is publicly available as Korean national standard KS X 6101 (OWPML - Open Word Processor Markup Language). The format has been in use since 2010 and became the default save format for Hancom Office in 2021.

Reference: https://www.hancom.com/support/downloadCenter/pubHwp