.xlsx
what is an xlsx file?
The xlsx file extension is an open XML spreadsheet document primarily used by Microsoft Excel since 2007. XLSX spreadsheets can contain multiple pages, formulas, images, and plots.
download xlsx sample file

ffc.xlsx example file is licensed CC0, Public Domain Dedication
xlsx file extensions
.xlsx
xlsx file extension name
Open XML Microsoft spreadsheet
xlsx file type
primary: Document
secondary: spreadsheet, data
xlsx file structure
Each xlsx file makes up a workbook. Workbooks are made up of one or more spreadsheets. Each spreadsheet is made up of rows and columns that correspond to individual cells.
associated organization
Microsoft
xlsx format specification and identification
xlsx files are actually zip files in disguise. Replacing the .xlsx extension with .zip on a simple 2-sheet xlsx file reveals the following structure:

xlsx MIME type
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
xlsx file signature hex
50 4B 03 04 14 00 06 00
xlsx ISO 8859-1
PK..
xlsx offset
0
xlsx magic number
50 4B 03 04 [PK]
xlsx file character encoding / charset
binary
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