Virtual hard drive files. These are preferred for larger games or software suites that require installation or offer faster loading times. How to Use These Files
As software grew more complex, hard drives became common. HDI files represent an entire virtual hard drive, often pre-configured with an operating system like MS-DOS or early Windows, allowing users to bypass the tedious "disk swapping" required by floppies. The Role of Consolidated Collections
Let's address the elephant in the RAR. Is this archive legal?
Do simply download the first RAR you find on a public forum.
Because you are dealing with 30-year-old software prepped by anonymous fans, you will run into issues.
listing of [PC98]PC98メーカー別詰め合わせ「し」.rar