.XLC File Extension
File TypeExcel Chart
This file is saved in a binary format, which requires a specific program to read its contents.
What is an XLC file?
Chart created with data from a Microsoft Excel spreadsheet; can be generated from a selection of data by selecting Insert→Chart within Excel; may be saved within the Excel spreadsheet (.XLS file) or separately as an XLC file.
NOTE: XLC files are no longer supported by Excel 2007 and later.