The .i00 file extension is used for one part of a split ISO image. These files were used to avoid issues with file systems and large sizes. You need the .mds file to burn or mount the image or convert it to an ISO. Use the .sfv file to check integrity to burn. The .i00 extension informs about the file content type and which software opens it. The format of this DVD Shrink Part 1 file was developed by DVD Shrink.
To open .i00 files, double-click the icon. If the operating system supports it, the file opens. First, verify DVD Shrink is installed to create file associations. Here is software to open .i00 files: DVD Decrypter, ImgBurn, Alcohol 120%, etc. on Windows; mdf2iso on Linux; Split&Concat on Mac.
Update the application you use to open .i00 files. Only the latest version supports the format. Scan for viruses with Norton or another antivirus. The file should be one of a group: .i00, .i01, .i02, etc. Also a .mds file defines the disk structure. DVD Shrink splits ISO images into smaller parts to fit on disks overcoming FAT32 limits.
DVD Shrink