There are many ways. However, you can create an .iso or .bin file from the CD and mount it on your computer virtually.
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No. You still need the disk. Therefore it is pretty much pointless to download the game to your hard drive.
Unless you have an expansion pack installed you will need the base game disk in order to play. If you do have an expansion pack any of the disks can be used to play.
You can't, you need the disk to install the game.
Doki Doki Panic is a game that was released in Japan in 1987. A person must have a Famicom Disk System to play this game.
It is a java game, it is impossible to play it without java.