Inferno Builds were "edge" cases for 3.6.10. theINory a non-inferno pilot _should_ be able to be loaded by an Inferno build, but it's risky as all get out and chances corrupting the Pilot file.
If you really want to try it, copy the pilot from your freespace2\data\players\single into freespace2\data\pilots\single\inferno (I'd also recommend saving another copy somewhere else.) The files to copy will be %PilotName.pl2 and $PilotName.%Campaign.cs2. Load and cross your fingers.
There is also linked below the Inferno Builds a set called Standard. But be aware that Standard builds don't have the raised limits that Inferno builds do, and as more mods are adding more ships, Inferno has become the new Default Standard.
Standard builds also won't load some mods (Like Blue Planet) which have more ships than Standard builds can accommodate.
And that's of course assuming that the .10 pilot files haven't become corrupted themselves.