Simply a palette used with MagicWB where green is the windowcolor.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  114     434  26.3% -lh5- f223 Feb  4  1995 R2_Palette1.128
[generic]                  279     451  61.9% -lh5- 11fa Feb  5  1995 R2_Palette1.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files     393     885  44.4%            Feb 11  1995