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Writing save files in RSM format is only enabled if `--save-format=rsm` command line flag is specified, because this implementation does not create save files that are fully compatible with the AliceSoft's implementation: * There is no simple way to determine the RSM format version used by the game. * There are several unknown fields in the RSM format. * Empty arrays are represented as NULL pages in xsystem4, so type information of such objects cannot be saved. These limitations are not a problem for the following use cases: * Use the created save files only in xsystem4 * Load save files created by System40.exe Also, RSM save files are much smaller and faster to read and write than JSON.