About FileHint

FileHint is a reference site for file extensions and MIME types, framed around a simple question: how should I handle this file?

What we cover

• Per-extension usage, how to open, and safety notes
• Per-MIME behaviour across browsers, servers, and email
• A File Signature Checker that verifies a file's real format
• Links to related and similar formats

Editorial policy

• Every page is written to include at least one actionable answer.
• Technical details come from primary sources — IANA, vendor documentation, RFCs, ISO standards — and every page cites them.
• Japanese and English are edited independently; we do not machine-translate.

Update policy

• Pages are refreshed as major browsers, operating systems, and format specs evolve.
• When a notable CVE lands (e.g. xz-utils 2024), we update affected pages as quickly as possible.
• Every page footer shows Updated: YYYY-MM-DD, which is also reflected in our sitemap.

Corrections policy

• Report typos, factual errors, or broken links via the contact page.
• We aim to fix confirmed technical errors within 7 days.
• Material corrections are called out at the top of the affected page for a visible period.

About the operator

FileHint is operated by Netwiz LLC (Japanese legal name: ネットウィズ合同会社). Revenue comes solely from Google AdSense; we do not run paid tiers, affiliate content, or sponsored posts — and we do not steer readers toward specific vendors. See the FileHint editorial team page for our editorial structure, and the contact page for questions or corrections.