File Extension XLSX

.XLSX File

File extension: XLSX
File type: Microsoft Office Open XML Format Spreadsheet
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First check your registry for invalid entries.


Notes about the XLSX file extension:



Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.

The XLSX file type is primarily associated with 'Excel' by Microsoft Corporation.

This is the new format for Microsoft Office documents.

It is a combination of XML architecture and ZIP compression for size reduction.

Microsoft promises the format will be open (published for anyone to use) and prior versions of Office, using components provided by Microsoft for Office 2000, XP, and 2003 will be available to perform document conversion. Remember that these are promises by Microsoft. We have yet to see the actuals. This format is not the same as the OpenDocument standard, also an XML-based standard being developed as a true open standard (see the OpenDocument Fellowship for more information).


Detailed information for file extension XLSX:


Primary association: Excel
Company: Microsoft Corporation
Mime type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Identifying characters Hex: 50 4B 03 04 , ASCII: PK
Related links: Microsoft Office Open XML Formats Guide, OpenDocument Fellowship, Using New Formats in Older Office Versions, FILExt Conversion FAQ
File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




Important: Invalid file associations could be the result of underlying issues within your Windows PC. It is highly recommended that you scan your PC for invalid registry entries, unused processes and other slowdown issues.

Technical data

To view technical data on file-extension XLSX click this link to expand/hide the additional area.

System Info for File Extension .XLSX

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: eDataSecurity-XLSX
EXEFile: %ProgramFiles%\Acer\Empowering Technology\eDataSecurity\decryption.exe

ProgramID: Excel.Sheet.12
EXEFile: %ProgramFiles%\Microsoft Office 2007\Office12\EXCEL.EXE /e

ProgramID: Excel.Sheet.12
EXEFile: %ProgramFiles%\Microsoft Office2007\Office12\EXCEL.EXE /e


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