X360ce-lib64-r848-vs2010-48

lib64: This indicates this is the 64-bit version of the library. This is crucial. You must use the version that matches the game's architecture, not your operating system. If you are playing a modern AAA game, it is likely 64-bit, so this is the file you need. If you are playing an older title (like the original Fallout 3 or Mass Effect), you might actually need the 32-bit version (x86) instead.
r848: This refers to the revision number (Revision 848). In the timeline of x360ce development, this represents a fairly stable, mature state of the software. It includes fixes for analog stick deadzones and trigger mapping that plagued earlier builds.
VS2010: This stands for Visual Studio 2010. This is the specific compiler used to build the DLL file. Why does this matter? Some older games—specifically titles built around 2010–2013—can be picky about runtime libraries. Builds compiled with VS2010 often have high compatibility with games from that specific era because they rely on the MSVC 2010 runtimes, which were standard at the time.
48: This is usually the build iteration for that specific revision.

Failed to Load Library: Make sure that the library is properly installed and the x360ce.ini file is correctly configured.
Controller Not Recognized: Check that the controller is properly connected and configured in the x360ce.ini file.

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The configuration file where your button mappings are stored. x360ce.gdb: x360ce-lib64-r848-VS2010-48