BK2 file extension is for Timed backup file for document window 2 WordPerfect for Win
Similar to BK2
4GE - Informix 4G Compiled source code file4GL - Informix 4GL language source code file
4MD - Musical file
4SW - 4DOS Swap file
4TH - Forth language source code file ForthCMP - LMI Forth
668 - Music the mixing is always at 12048Hz
669 - 669 Composer 8-channel MOD Music File
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