I'm using 64-bit Windows. Method 4, Step 2, "Configure the linker 'Additional Library Directories'," mentioned selecting x86. Since I'm using 64-bit, can I choose x64?

You can use x86 platform (32 bits) with Windows 64-bit. However if you need x64 do this: Create a new empty project. Follow the article's instructions with these changes: 1. In Project's Property Pages wizard 1.1. In ''Platform:'' entry, choose ''x64" 1.2. Click [Configuration manager...], 1.2.1. In ''Active solution platform:'' select x64, 1.2.2. In ''Platform'' entry choose x64. Click [Close]. 1.3. In "Linker" > "General" > "Additional Librariy Directories'' > down arrow at the end of the field > Edit.. > three dots > in "Select Directory" window, navigate to C:\SDL\SDL2\lib\x64, and click [Select a folder]. 2. In Windows File Explorer navigate to C:\SDL\SDL2\lib\x64 and copy file SDL2.dll. Paste in your project folder.