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.crc files are circular reference files (created and updated each time you regen an assymodel). They store an explanation of a circular ref that you have designed into the assembly.
They can be deleted but unless you get rid of the circ. ref. they will be recreated each time you regen.
They are always created when ever you assembly has lopped back references, so try avoiding referencing randomly but plane it well. To have a good start read out the .crc file thoroughly and find out what ref. are looped back.
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