[marc@blackhat Desktop]$ ll *.*x
-rwxr--r-- 1 marc marc 15309 Apr 20 12:39 sample.docx
-rwxr--r-- 1 marc marc 37328 Apr 20 12:39 sample.pptx
-rwxr--r-- 1 marc marc  8836 Apr 20 12:39 sample.xlsx
[marc@blackhat Desktop]$ file *.*x
sample.docx: Zip archive data, at least v2.0 to extract
sample.pptx: Zip archive data, at least v2.0 to extract
sample.xlsx: Zip archive data, at least v2.0 to extract
[marc@blackhat Desktop]$ cp -a sample.xlsx marc.xlsx
[marc@blackhat Desktop]$ unzip marc.xlsx
Archive:  marc.xlsx
  inflating: [Content_Types].xml     
  inflating: _rels/.rels             
  inflating: xl/_rels/workbook.xml.rels  
  inflating: xl/workbook.xml         
  inflating: xl/theme/theme1.xml     
  inflating: xl/worksheets/sheet2.xml  
  inflating: xl/worksheets/sheet3.xml  
  inflating: xl/worksheets/sheet1.xml  
  inflating: xl/sharedStrings.xml    
  inflating: xl/styles.xml           
  inflating: docProps/core.xml       
  inflating: docProps/app.xml        
  inflating: xl/calcChain.xml        
[marc@blackhat Desktop]$