CHD Manager 1.2.1

CHD Manager is now Game Format Converter. This is an old release. The current version is Game Format Converter 2.1.0. The old program can't update itself to it, so please download it once by hand.

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Fixes found by testing on 42 real discs

• "None" compression plus verify no longer reports a false "Verify failed". chdman can't verify an uncompressed CHD, so the app now says so and keeps your source files.
• When a job fails, chdman's real error message is now shown in the log and in the Result column (it was being hidden).
• Dreamcast CD discs that start with audio tracks now get a platform label.
• Folder scans now say which files they skipped (.cdi, .pbp and similar can't be read by chdman).
• The suggested-settings text now cites measured results.

How it was tested: 42 real discs (6 Dreamcast GD-ROM, 3 Dreamcast CD, 16 PS1, 17 PS2; 7.3 GB of CHDs). All 42 verified, extracted, and rebuilt with the same data SHA-1 as the originals. The DVD path was checked on real PS2 ISOs (4.4 GB and 1.4 GB). Compression levels and thread scaling were measured. Rebuilt CHDs booted in PCSX2 (PS2, CD-type and DVD-type), DuckStation (PS1) and RetroArch with Flycast (Dreamcast), including zstd, uncompressed and larger-hunk builds. I checked that games boot and show their intro; I did not play them through. Full numbers are in the README's Testing section.

Download CHD-Manager-1.2.1-win64.zip, unzip it anywhere, and run CHD Manager.exe. Windows 10/11, 64-bit. Python is not needed. Includes chdman 0.289. If you are on 1.2.0, the app will offer this update itself.

Heads up: the exe is not code-signed, so Windows SmartScreen may show "unknown publisher" (choose More info, Run anyway), and some antivirus programs can be suspicious of packaged Python programs. You can also run CHD_Manager.pyw from source or build the exe yourself with build.ps1 (see the README).

SHA-256 of the zip: F930702994344674F2089F60C70CD630D8119F97C243B99D67C5B8D5B43E16B2