RELOAD is a generic binary serialization format, currently used in OHRRPGCE.
The name apparently stands for "Really Efficient List Of Arbitrary Data".
The file begins with the four ASCII characters
The structure is a kind of tree structure, with one root node. Each node has a name, value, and list of zero or mode nodes it contains. The names are all stored together, so that each name is stored only once and then are referenced by numbers. The types of values available are: null, integers (up to 64-bits), double-precision floating point, and strings of bytes (and can also include null bytes).