Observed arrival · 2026-10-25

CantOpen: a file-identification desk in your browser

cantopen.com Visit website

Editorial interest 79/100 Selection signal · not a rating of the site

CantOpen identifies unfamiliar files from their contents and offers browser-based ways to view or convert some formats.

Landing page captured for the 2026-10-25 issue.

For: People trying to identify or open unfamiliar files
Worth noticing: The format list reaches from DICOMDIR and protected RPMSG messages to Primavera XER schedules and Parquet tables.

Field notes

The workflow is organized around identifying a file before choosing what to do with it: the page describes matching signatures and selected archive contents against a list of recognized formats. Its coverage spans both familiar office exports and more specialized material, including DICOMDIR indexes, Primavera schedules, and GIS data. The homepage also provides links to standards and vendor documentation for some formats.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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