DOWNLOAD
Download Threebrook Pack
For Windows 10 and 11 (64-bit). Free, no sign-up. The app follows your Windows display language: Chinese or English.
RECOMMENDED
Installer (MSI)
Double-click to install it for your user only; no admin rights needed. It adds Compress and Extract to File Explorer’s right-click menu, plus icons and thumbnails for .iis and .iisz files. Remove it in Windows Settings › Apps.
- ThreebrookPack-0.3.0-win-x64.msiAbout 4.9 MB
DEPLOYING TO MANY PCS
Silent install
Same installer. To install on several line PCs, run this in a Command Prompt:
msiexec /i ThreebrookPack-<version>-win-x64.msi /qn
To install for every user on the machine, open the Command Prompt as administrator and add ALLUSERS=1. Options and exit codes are in Help.
Check the download
Please download only from this site. Copies passed around elsewhere may have been modified.
SHA-256 checksums (0.3.0)
b654986bb86e111f966101fb8c6a03e22d4e81cf350e1b640b0c257497bab97f ThreebrookPack-0.3.0-win-x64.msi
To check, open PowerShell in your download folder and run Get-FileHash file-name, then compare the result with the list above.
Requirements
- System
- Windows 10 or 11, 64-bit
- Runtime
- No VC++ runtime or .NET to install
- Admin rights
- Not needed to double-click install; needed to install for all users
- Network
- Not needed; it works entirely offline
- Storage
- About 13 MB once installed
Getting started
- Double-click the downloaded .msi and follow the steps.
- In File Explorer, right-click a folder of images, choose “Threebrook Pack: Compress (to a .iisz package)” and click Compress. On Windows 11 it’s under “Show more options”.
- Double-click the new .iisz to look at the images inside; right-click it and choose “Threebrook Pack: Extract here” to restore them.
The app isn’t code-signed yet. If Windows says it “protected your PC”, click “More info”, then “Run anyway”.
What’s new in 0.3.0
- First public release. Use it like ZIP: in File Explorer, right-click a folder to pack it into one .iisz package, right-click a BMP, TIFF or RAW to compress it to a .iis, and right-click to extract.
- Images are compressed losslessly as images (JPEG-LS), and extracted files are byte-for-byte identical to the originals. Every compression and extraction is checked with SHA-256; on a mismatch you get an error and no file is left behind. Files that wouldn’t get smaller (JPG, PNG and so on) are stored as they are.
- Double-click a .iisz to browse it like a folder and click an image to view it. The viewer zooms, has 16-bit window/level and Bayer preview, and also opens ordinary BMP, TIFF, RAW, PNG and JPEG files.
- Thumbnails in File Explorer: a .iis shows the picture itself, a .iisz a mosaic of its first four images.
- Headerless .raw files get their width, height and pixel format detected automatically (8, 10, 12 and 16-bit, and packed formats).
- Command-line tool iis-cli: pack, unpack, list, verify and more, for batch scripts.
- Chinese or English follows your Windows display language, and light or dark follows Windows. Double-clicking installs it for the current user without admin rights; it can also be deployed silently for all users.