The Xtreme help file shows the following:
Palette Import Formats
.CPL CorelDRAW Palette
.PAL CorelDRAW Palette
.PAL Microsoft Palette
.PAL PaintShop Pro Palette
.ACT Adobe Color Table
.ACO Adobe Color Swatch
Although not mentioned in the help file Xtreme also uses a .jcw file format for color palettes. I have searched using google and cannot find any reference to that format.
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