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2HD File

What are 2HD files and how to open them

Are you having problems opening a 2HD file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 2HD files.

What is a 2HD file?

A .2HD file is a Mahalito 2HD Disk Image file.

This format is used by the PC-98 series Mahali­to utility to store a floppy-disk image. It pairs with a .dat file to hold the raw data from one side of a high-density floppy (2HD), typically when capturing or writing floppy disks under MS-DOS on a PC-98. Mahali­to produces two files when imaging: one with the .2hd extension (format information) and one .dat (the full data image). Most uses of a .2hd file require its matching .dat to be present.

Mahali­to is written for MS-DOS on NEC's PC-98 and supports floppy formats including 2HD (high density), 2DD (double density), and 2D (single density). Users can image physical floppy disks, transfer the .2hd/.dat pair out of the PC-98 environment, and convert those into other image formats (such as D88) for emulation or preservation. For writing back to physical disks Mahali­to's commands allow specifying 2HD mode and using the .2hd/.dat together.

Files in this format begin with the ASCII signature ver1.10 at offset zero in the .2hd file, i.e. the first bytes are "ver1.10".

How to open 2HD files

Important: Different programs may use files with the 2HD file extension for different purposes, so unless you are sure which format your 2HD file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 16, 2026

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