I'm assuming these are files that you copied from your Wii to an SD card? If so, they're encrypted with a console-specific key. If you dump the NAND memory of the console and import it into Dolphin, you'll be able to use Dolphin to copy the .bin files from a virtual SD card into the emulated Wii Menu.
https://wiki.dolphin-emu.org/index.php?title=NAND_Usage_Guide
https://wiki.dolphin-emu.org/index.php?title=Virtual_SD_Card_Guide
If you don't have a NAND dump of the console, and you don't have access to the console anymore to make one, then I'm afraid it isn't possible to use the files you have.
https://wiki.dolphin-emu.org/index.php?title=NAND_Usage_Guide
https://wiki.dolphin-emu.org/index.php?title=Virtual_SD_Card_Guide
If you don't have a NAND dump of the console, and you don't have access to the console anymore to make one, then I'm afraid it isn't possible to use the files you have.