What is .HSI file extension?
System file created by Indexing Service, a component of the Windows operating system used for creating a searchable file system index; commonly created in the C:\System Volume Information\catalog.wci\ directory.
HSH files are saved alongside several other index files that together comprise the search index. Other file types include .000, .BK1, .BK2, .PS1, .PS2, and .FID files.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.