The file typically refers to a high-definition (HD) character preset or texture mod , most commonly associated with 3D modeling software like Daz 3D or video game modification communities (such as those for The Sims or Skyrim ).
A "Readme.txt" file explaining how to extract the contents into the specific application's library folder. Abby_HD_v1.rar
Since ".rar" files are compressed archives, the text associated with them usually includes: The file typically refers to a high-definition (HD)