When you create a fluid cache, your cache is saved to disk as a .mc (Maya cache) file and an .xml description file is generated for your cache. The XML (eXtensible Markup Language) description file contains a list of important cache attributes that Maya uses to locate the cache files for your fluid objects, and a list of fluid attribute values (see extra) that identifies what fluid effect setups correspond with which cache files.You can use the XML description file to keep track of your Fluid cache files and scenes.

For more information about nCache file formats, see nCache XML description file.