DWB
From Just Solve the File Format Problem
VariCAD is 2D/3D drawing software developed by a Czech company since 1988.[1]
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File Information
VariCAD's native proprietary binary format is in the .DWB format. DWB files have the "870100" beginning at byte 2. Byte one seems to indicate version. Version 7 header is "32870100" Version 9 header is "34870100", the current version of VariCAD 2020, files begin with "4C870100"
Starting in version 7, file format was changed.[2]