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What's New

1.3.1

Fixed

  • WinFsp folder mounts failed and were unreadable — WinFsp creates the folder mount point itself and rejects an existing directory with STATUS_OBJECT_NAME_COLLISION, yet the app pre-created it, so every elevated (cross-integrity) mount failed. The directory is no longer pre-created (only an empty leftover is cleaned up). The cross-integrity security descriptor was also ownerless, which Windows' AccessCheck rejects with "The security descriptor structure is invalid", leaving mounted drives unreadable; both builders now share a descriptor with owner/group and Full Access for SYSTEM, Administrators and Everyone.
  • FUSE layer is now a NuGet package — the vendored FuseSharp sources were replaced by the LibFuseSharp 1.0.0 package (MIT, net8.0/net9.0/net10.0), including the mount-exit, ENOTDIR and quiet-probe improvements.

Changed

  • Main window title is now just CHDMounter (it no longer appends the mount core).
  • Help → Donate menu item opens the donation page.
  • About → FuseSharp now credits the standalone LibFuseSharp library.
  • README badges expanded (platforms, architecture, mount cores, docs, community).

Bundles

Bundle Platform Architecture
release_1.3.1_win-x64.zip Windows x64
release_1.3.1_win-arm64.zip Windows ARM64
release_1.3.1_linux-x64.zip Linux x64
release_1.3.1_linux-arm64.zip Linux ARM64
release_1.3.1_osx-x64.zip macOS Intel
release_1.3.1_osx-arm64.zip macOS Apple silicon

Every bundle contains CHDMounter (CHDMounter.exe on Windows), LICENSE.txt, README.md and WhatsNew.md, and requires the .NET 10 runtime.

1.3.0

Fixed

  • Settings and About windows were unresponsive — every modal dialog was opened by blocking the UI thread on the dialog task, so the window rendered but never processed input: the settings check-boxes/radio buttons could not be toggled and the About links (and the update banner) did nothing. Dialogs are now awaited, so the UI stays responsive while a dialog is open.
  • Absolute Linux/macOS paths were dropped from the command line — the parser treated any argument starting with / as a flag, so /home/user/game.chd was ignored and nothing mounted. Only the documented /l, /a and /s:<alias> flags are recognised now.
  • F8 screenshots in single-file builds were written to the .NET extraction directory instead of the application folder; the screenshot folder is now resolved from the running executable's path.
  • SIGTERM/SIGHUP/Ctrl+C left the GUI running after unmounting; the application now shuts down cleanly on these signals (documented in the usage guide).
  • Bug-report queue could stall — a race in the queue hand-off could pin a thread at 100% CPU and stop all later reports from being sent.
  • Window could not be closed if unmounting kept failing; the closing path now gives up after one attempt instead of retrying forever.

Changed

  • One application instead of two — the Dokan, WinFsp and Core projects are merged into a single CHDMounter application. There is now one download per platform/architecture (release_<version>_<rid>.zip) instead of separate Dokan and WinFsp bundles.
  • Cross-platform UI — the WPF interface was ported to Avalonia with the same dark theme and layout, and the application now runs on Windows, Linux and macOS (x64 and ARM64).
  • Selectable mount core — choose Dokan (default) or WinFsp on Windows in Settings → Mount core. Linux and macOS mount through FUSE 3 (libfuse3 / macFUSE) using the bundled FuseSharp library.
  • Per-platform settings — settings stay DPAPI-encrypted on Windows and are stored as plain JSON on Linux/macOS.
  • VideoGameFileSystemParser is now a NuGet package — the vendored parser project was removed from the solution; CHDMounter references the VideoGameFileSystemParser 1.4.0 package.

Bundles

Bundle Platform Architecture
release_1.3.0_win-x64.zip Windows x64
release_1.3.0_win-arm64.zip Windows ARM64
release_1.3.0_linux-x64.zip Linux x64
release_1.3.0_linux-arm64.zip Linux ARM64
release_1.3.0_osx-x64.zip macOS Intel
release_1.3.0_osx-arm64.zip macOS Apple silicon

Every bundle contains CHDMounter (CHDMounter.exe on Windows), LICENSE.txt, README.md and WhatsNew.md, and requires the .NET 10 runtime.

1.2.1

Fixed

  • WinFsp variant could never mount — the single-file release did not extract its content, so Fsp.Interop.Api's static initializer failed with The type initializer for 'Fsp.Interop.Api' threw an exception even when WinFsp was installed (reported as bugs 67653–67656 and 67777/67778). The WinFsp bundle now extracts its content to disk so the WinFsp.NET bindings can locate winfsp-msil.dll and initialize correctly.
  • WinFsp detection is now a full compatibility check — the app loads the native WinFsp DLL, resolves every entry point the bindings need, and verifies the native/managed version match before attempting a mount. Missing or outdated WinFsp now shows an actionable "install or repair WinFsp" dialog instead of failing mid-mount.
  • ARM64 WinFsp — the native DLL probe now selects winfsp-a64.dll on ARM64 instead of looking for the x64 DLL and reporting WinFsp as missing.
  • Mount-point folder creation is retried — a folder mount point that cannot be created no longer aborts the remaining drive-letter/folder candidates.
  • ISO 9660 / PC-FX multi-extent matching — continuation records must match byte-for-byte (ordinal). Case-insensitive matching could merge two distinct Joliet names into one file.
  • HFS/HFS+ catalog deduplication — deduplication is now ordinal, so HFSX volumes with names that differ only by case keep all entries.
  • VideoGameFileSystemParser public API — FileEntry.Extents and SectorReader.Tracks are List<T> again (they had been changed to IList<T>, breaking external consumers).
  • Bug-report noise — known test hosts (testhost, vstest, ReSharperTestRunner, xunit.console, NUnit, MSTest) can never file production bug reports, while the CHDMounter_Tester application keeps its diagnostics.
  • User-error handling — missing drivers, wrong console type, busy mount points and similar environment problems are logged without filing a bug report; genuinely unexpected mount and unmount failures are still reported with full stack traces.

Changed

  • Release bundles are framework-dependent — the .NET runtime is no longer embedded. Each bundle contains a single CHDMounter.exe plus LICENSE.txt, README.md and WhatsNew.md, and requires the .NET 10 Desktop Runtime.
  • Update checker now points at the canonical repository purelogiccode/CHDMounter.
  • The Tester application is no longer published in releases.

Bundles

Bundle Architecture Driver
release_1.2.1_Dokan_win-x64.zip x64 Dokan
release_1.2.1_Dokan_win-arm64.zip ARM64 Dokan
release_1.2.1_WinFsp_win-x64.zip x64 WinFsp
release_1.2.1_WinFsp_win-arm64.zip ARM64 WinFsp

1.2.0

  • Added the WinFsp variant alongside the Dokan variant.
  • 37 console/format modes, virtual CUE/BIN/ISO/WAV export, SingleFile ISO passthrough.
  • Console selection is alias-only (e.g. ps2, cuebin2352).
  • Vendored VideoGameFileSystemParser as a project reference.
  • Added the CHDMounter Tester batch-parsing/benchmarking application.
  • Bug-report API, logging, settings and mount diagnostics improvements.

1.1.0

  • Added diagnostics logging, update checker and statistics reporting.
  • Wildcard enumeration fixes on mounted virtual drives.
  • Removed the CHDSharp dependency from the application (now via VideoGameFileSystemParser).
  • README and release process improvements.

1.0.0

  • First public release: mount CHD images as virtual read-only drives with Dokan.
  • ISO 9660, UDF, XDVDFS, OperaFS, CD-i Green Book and HFS/HFS+ support.