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Bear in mind that when trying to dump cartridge games, there's a significant risk of having corrupt sectors in the resulting dump. If you're using your DIY adapters but don't know what you are doing, there's a risk of damaging the original cartridgedue to out-of-spec voltages.

The Wii VC releases are most of the time ready to work in emulators. In fact, Nintendo was so kind they even included the iNES headers in NES roms ROMs (16 bytes at the beginning of the ROM that are not part of the original cart data yet the emulator needs them to know which mapper it is and run the game at all). You can even replace the ROM with one from the same system from your choice, and get it to run if Nintendo's emulators are compatible. The discovery of iNES headers in VC releases led to a rumour wherein Nintendo, or at least those whom Nintendo subcontracted for the re-releases, merely downloaded their own games off a ROM site, though while both the VC release of ''Super Mario Bros.'' and pirated copies of it do share the same checksum (and are thus identical), it might be just a coincidence, and knowing Nintendo they will certainly deny any such accusations of pirating their own games.