BaseIDs are the CRC-32 hash of the model’s file name. Note that in YW1, only the first three numbers are included, while later titles use the whole file name. The layout of a model’s file name (excluding certain test models) is shown below:
The layout can be represented in form xYYYYYY. x is a character representing the type of model. YYYYYY is a 6 digit number with no specific purpose other than being unique within its type.