Extract text from PC-98 disk images (HDM)
To convert HDM disk images to another format, you need Neko Project II or other Disk Image software.
To convert other file formats to the "Emulation Disk Dump" file type, you need software like Neko Project II or a similar tool.
The .HDM extension primarily identifies a PC-98 Disk Image, a raw data dump of a floppy or hard disk from the NEC PC-9801 series of Japanese microcomputers. These binary files are essentially digital preservation capsules used today with emulators like Neko Project II or Anex86 to run retro games and software. The main issue for users is that .HDM files are unreadable by modern operating systems (Windows, macOS) and require specific emulator configurations - often with Japanese BIOS files and Shift-JIS character encoding - to function. They are distinct from the more common HDI (Hard Disk Image) or FDI formats, leading to compatibility errors in certain emulator builds.
For archival or extraction purposes, users often need to convert these disk images into raw binary IMG files or extract specific contents to standard formats using tools like DiskExplorer.
A secondary, less common use of this extension is for Handheld Device Markup Language (HDML) files. Developed by Openwave, this text-based format was a precursor to WML for early mobile web browsing. These files are now obsolete and incompatible with modern browsers; converting them to HTML or TXT is the only way to inspect the legacy code structure.
Convert.Guru analyzes your HDM file, detects the exact format, and lets you read the text inside.
Users also converted HTM, HTML, PDF, UMD, VGA and D80 files.
If you want to convert HDM file to PDF, HTML, HTM, CSS, JS, PHP, ASP, ASPX, JSP, JSPX, PY or RB, you can use Neko Project II or similar software from the "PC-98 Emulation Disk Image" category. In the File menu, look for Save As… or Export….
To convert RSS, CSS, CGI, SITEMAP, PL, WEBMANIFEST, JSON, JS, XML, HTML, ICO or HTM files to HDM, try Neko Project II or another comparable tool in the "PC-98 Emulation Disk Image" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our HDM converter.