Legacy MDL Format
From FSDeveloper Wiki
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The Legacy MDL format used .dll files that were actually loaded as flight simulator modules. They don't contain any true executable code other than the basic stub code required to hook it to the FS Process. All of the actual model code is located in the dll's resource table as a single entry. The data consists of a subset of the BGL language, as the model is rendered directly by BGL opcodes.
