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+Used in 0.8.0:
+* wallet.dat: personal wallet (BDB) with keys and transactions
+* peers.dat: peer IP address database (custom format); since 0.7.0
+* blocks/blk000??.dat: block data (custom, 128 MiB per file); since 0.8.0
+* blocks/rev000??.dat; block undo data (custom); since 0.8.0 (format changed since pre-0.8)
+* blocks/index/*; block index (LevelDB); since 0.8.0
+* chainstate/*; block chain state database (LevelDB); since 0.8.0
+* database/*: BDB database environment; only used for wallet since 0.8.0
+
+Only used in pre-0.8.0:
+* blktree/*; block chain index (LevelDB); since pre-0.8, replaced by blocks/index/* in 0.8.0
+* coins/*; unspent transaction output database (LevelDB); since pre-0.8, replaced by chainstate/* in 0.8.0
+
+Only used before 0.8.0:
+* blkindex.dat: block chain index database (BDB); replaced by {chainstate/*,blocks/index/*,blocks/rev000??.dat} in 0.8.0
+* blk000?.dat: block data (custom, 2 GiB per file); replaced by blocks/blk000??.dat in 0.8.0
+
+Only used before 0.7.0:
+* addr.dat: peer IP address database (BDB); replaced by peers.dat in 0.7.0