Almost every day someone asks how to convert Gamecube .gci, .gcs, or .sav save files into RAW memory card files. If someone asks you how to do that, then please link them to this thread.

Here is a detailed tutorial about how to convert .gci, .gcs, or .sav saves into .raw memcards:

1: Install Dolphin emulator from here.
2: Open Dolphin.exe.
3: Under "Tools", click "Memcard Manager (GC)".
4: Select the left "Browse" button.
5: Select a blank .raw memory card file. (If you don't have one, there is one included in the attachment.)
6: Select "<- Import GCI".
7: Select your .gci, .gcs, or .sav save file.
8: Close the "Memcard Manager" window.

If you want to use your new .raw file with Nintendont, then follow these steps:
1: Rename your .raw file to "<4_letter_game_id>.raw". (Example: "blankcard.raw" with Lugi's mansion should be named "GLME.raw".)
2: Place this .raw file in "<Drive_with_GCN_games>\saves\<4_letter_game_id>.raw".
NOTE: Make sure you place the .raw file on the same drive as your Gamecube ISOs. This is not necessarily the same drive that Nintendont is running from.
3: Set "Memcard Emulation" to "On" and "Memcard Multi" to "On".
NOTE: The settings in USB loaders may be different.

Attached are:
- A blank 8MB .raw Gamecube Memory Card: "blankcard.raw"
- A .gci save from Luigi's Mansion that I know works with this process: "GLME.gci" (In the save game, everything is completed except the final battle with King Boo.)
- A .wmv video of me demonstrating the process: "gci2raw_demo.wmv"

NOTE: The attached .rar file is actually in .7z format. (GBAtemp won't allow me to upload 7z files. :p) If you don't have 7zip, then you can get it here.