What is a SPARSEFS File Type?
SPARSEFS is designed to contain a file system that imitates the MultiMediaCard. It most likely contains root.fs, kernel.elf, initrd (initrd.img) and the "custpack " files, and the initrd directory. Just a minute.
The SPARSEFS folder is used only by the Windows version of BlueStacks. It is in\ directory Bluestacks\ Android\.
What is a Default SPARSEFS File Name?
Data.sparsefs - The directory containing the data for an application imitated by BlueStacks.