.SPARSEFS File Extension
What is an SPARSEFS file?
Folder used by BlueStacks, an Android emulator for Windows and OS X; contains multiple files that hold data for apps that are emulated in BlueStacks.
SPARSEFS is designed to hold a file system, which is used to emulate the embedded MultiMediaCard (eMMC). The folder most likely contains the root filesystem (root.fs), the kernel (kernel.elf), the initrd file (initrd.img), and the "custpack" (prebundled.fs).
NOTE: The SPARSEFS folder is only used by the Windows version of BlueStacks. It is located in the \Bluestacks\Android\ directory.
Common SPARSEFS Filenames
Data.sparsefs - The name of the folder that contains the data for an app emulated by BlueStacks.