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This is not the current version.

The official NetHack 3.4.3 binary for Intel 386 compatible machines running OS/2.

Step 1: download.
Click on the link below to download NetHack. Depending on your browser you may need to right-click so that the file is saved to disk and not displayed.

nethack-343-os2.zip (about 940K) (MD5 sum: 5d60c7a85fe58116a530938260a6322d)
This file packaged with InfoZip 5.x contains a 32-bit binary built using EMX 0.9d. In principle it should be runnable on OS/2 version 2.0 or later but has not been tested on any version other than 4.0.

Download this file

Click on the link below to download NetHack. Depending on your browser you may need to right-click so that the file is saved to disk and not displayed.

nethack-343-os2-X11.zip (about 1.2M) (MD5 sum: c2b48b6a07b138bac91c0ba7fb7d592f)
This file packaged with InfoZip 5.x contains a 32-bit binary built using EMX 0.9d and requires the EMX runtime libraries and dynamically linked against the XFree86 libraries for OS/2. It requires that these libraries along with XAW.dll be installed to function and will run in both text mode and X11 tiles mode.

Download this file
Step 2: unpack.
NetHack is shipped in a single archive created with zip - unpack it in an empty directory.
Step 3: install.
See the README unpacked in step 2 for additional instructions.
Save and bone files are compatible between these two executables.

Hosted courtesy of alt.org.