GDA
From Dragon Age Toolset Wiki
GDA files contain 2DAs that have been converted from their Excel-format source into a form that can be used by the toolset and the game.
GDAs are GFF files and can be opened with the GFF editor.
The headers of 2DA files are stored as a numeric hash, generated with the CRC32 hash algorithm used on the lowercase of the string (so it is case independent).
