This document presents a key-value store library called XLS_KVS that allows storing and editing key-value pairs in a Microsoft Excel workbook for local environments. The library uses Ruby and the Excel COM API to interact with Excel workbooks, allowing values to be stored, retrieved, updated, and deleted directly from Excel in an easy-to-use manner. The library is designed to integrate Ruby with a familiar tool like Excel to provide a key-value data store that can be edited directly.