# Sailfish OS ## Identification `.appx` identifies a Windows application package. [[Connected Devices Platform|Connected Devices Platform]] supports cross-device experiences in Windows. [[FydeOS|FydeOS]] is a Chromium-OS-based system that supports web, Android, and Linux application environments ([FydeOS overview](https://fydeos.io/help/faq/about-fydeos/what-is-fydeos/)). [[Bliss OS|Bliss OS]] brings Android-derived systems to PCs, while [[Sailfish OS|Sailfish OS]] is a mobile Linux platform. ## Notebook evidence - [[Scanned_20260730-1719#PDF page 17 — Windows packages, connected devices, and alternate operating systems|PDF page 17: Windows packages, connected devices, and alternate operating systems]] — The page begins in Windows package archaeology and then escapes into alternate operating systems. The common question is how a device’s application model can be replaced or extended across Windows, Chromium, Android, and mobile Linux. ## Relationships and overlays The source places this note in a shared evidence cluster with [[Bliss OS|Bliss OS]] · [[Connected Devices Platform|Connected Devices Platform]] · [[FydeOS|FydeOS]] · [[Scanned_20260730-1706|Scanned_20260730-1706]]. Within the larger collection, this evidence extends [[Vendor-Agnostic Recovery|vendor-agnostic recovery]] and [[Continuity Architecture|continuity architecture]] by showing how software, hardware, identity, and pre-OS control depend on recoverable interfaces. ## Evidentiary status and open leads Resolve the APPX publisher suffix and whether “IHDR” is a filename, PNG chunk type, or acronym copied from inspection output. ## Source - [[Scanned_20260730-1719|Scanned_20260730-1719]]