2026.08.26

DOSBox Pure Standalone — Release Notes (2026-08-26)

This Windows x64 release adds reliable virtual-CD mounting for nested ZIP
containers larger than 2 GiB.

What changed

• Preserves 64-bit file positions through local, ZIP, writable overlay, and
  mirror handles.
• Supports IMGMOUNT D C:\CD.ZIP -t zip for large nested ZIP data CDs.
• Registers the mounted ZIP drive with MSCDEX for normal game CD detection.
• Keeps the nested archive memory/archive-backed without reconstructing it on
  disk.
• Adds the command, lowercase zip requirement, limits, and storage advice to
  makegame --help and the project documentation.

Store an already-compressed nested ZIP without further compression in the outer
archive when practical. Individual files inside the nested ZIP remain limited
to 4 GiB minus one byte, and the completed standalone executable must remain
smaller than 4 GiB because of the Windows loader limit.

Validation highlights

• Ripper mounted a 3,090,933,320-byte nested CD.ZIP, detected drive D as a
  CD-ROM, and entered the game.
• A deterministic entry beyond 2 GiB and an external ZIP64 entry beyond 4 GiB
  were both read successfully.
• The embedded-resource and internal-disk-image regression package exited with
  code 0 and retained both expected markers.
• ReleaseGLCORE | x64 built with zero warnings and errors.
• The self-contained .NET 8 package builder published successfully.
• Process Monitor found no nested ZIP or game-content reconstruction on disk.

No game content is included. Generated executables are unsigned.

Download checksum

• DOSBoxPureStandalone-win-x64-2026-08-26.zip
• SHA-256: C2492752921E924568B995E916D344A0617B934783D0BCC06BB3C9BC4E21AD12