.GRL File Extension
File TypeWindows Update Status File
What is a GRL file?
Status file used by Windows Update; stores information about the current Windows configuration; named either "active.grl" or "pending.grl" and is stored in the \windows\winsxs directory by default.
NOTE: If a Window Update produces a "0x80073712" error code, you may need to delete the pending.grl and pending.xml files. Then the update should run successfully.