This "Chart Conversion" option is used only when you are saving charts into a new Solar type chart file. It determines the internal format of any Solar type chart file which is created by this utility.

Create v1/2 format chart files - Newly created chart files will be compatible with Solar Fire v1 and v2 only.

Create v3/4 format chart files – Newly created chart files will be compatible with Solar Fire v3 and higher, but when used with Solar Fire v5 and higher cannot be used to store non-natal type charts, chart ratings or source comments. Choose this option if you wish to create chart files that can be used by owners of Solar Fire v3 and v4.

Create v5 format chart files - Newly created chart files will be compatible with Solar Fire v5 and higher but when used with Solar Fire v6 higher cannot be used to store Life Events. Choose this option if you wish to create chart files that can be used by owners of Solar Fire v5.

Create v6 or higher format chart files - Newly created chart files will be fully compatible with Solar Fire v6 or higher versions, but cannot be used with any older version of Solar Fire. Choose this option if you want to be able to save Life Events with your charts.

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