Browse Definitions :
File Extension

XLSX File Format

Microsoft Excel Open XML Document

XLSX is a file extension for an open XML spreadsheet file format used by Microsoft Excel.

Microsoft introduced the open XML standard to Microsoft Office in 2007 after a push from business users who saw the value in an open file format for transferring data between applications and other areas of working with the files. Support can also be added to earlier versions of Excel with Open XML component support.

MIME type:  application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

 

 

Learn more about XLSX files:

Visit the Microsoft Excel webpage.

Wikipedia has an entry on Office open XML.

Search for answers to XLSX-related questions at IT Knowledge Exchange.

This was last updated in July 2010
Browse File Extensions Alphabetically:

Ask a Question. Find an Answer.

Ask your peers a question about this file extension.

Ask a Question

Join the conversation

2 comments

Send me notifications when other members comment.

Please create a username to comment.

.xlsx file sent as e-mail attachment. Receiver's e-mail program (or some security?) apparently deleted same as it was not received (and did not go into any trash folder). Converted to .pdf and it -was- correctly received. Original file scans with no problem with Jotti's amd Virustotal.
Cancel
I have just bought MS Office the latest version and assumed that when someone sent me an e mail with an XLSX attachment that I would be able to open it...I can open it but it is text that is entirely undecipherable - what can I do ?
Cancel

-ADS BY GOOGLE

SearchCompliance

  • California Consumer Privacy Act (CCPA)

    The California Consumer Privacy Act (CCPA) is legislation in the state of California that supports an individual's right to ...

  • compliance audit

    A compliance audit is a comprehensive review of an organization's adherence to regulatory guidelines.

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

SearchSecurity

  • spear phishing

    Spear phishing is an email spoofing attack that targets a specific organization or individual, seeking unauthorized access to ...

  • bridge

    A bridge is a class of network device that’s designed to connect networks at OSI Level 2, which is the data link layer of a ...

  • browser isolation

    Browser isolation is a cybersecurity model for web browsing that can be used to physically separate an internet user’s browsing ...

SearchHealthIT

SearchDisasterRecovery

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

  • business continuity software

    Business continuity software is an application or suite designed to make business continuity planning/business continuity ...

SearchStorage

  • business impact analysis (BIA)

    Business impact analysis (BIA) is a systematic process to determine and evaluate the potential effects of an interruption to ...

  • RAID (redundant array of independent disks)

    RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks to ...

  • dedicated cloud

    A dedicated cloud is a single-tenant cloud infrastructure, which essentially acts as an isolated, single-tenant public cloud.

Close