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File Extensions

Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.

16
Indexed file extensions

Find the right information for any file extension

Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.

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16 extensions
Data Letter: X Clear all
.X3D

Extensible 3D Graphics

X3D (Extensible 3D Graphics) is an open, royalty-free ISO standard for defining 3D computer graphics. It is the successor to VRML (Vir…

Data
.XER

Primavera P6 Proprietary Exchange Format

The XER file format is a proprietary file format used by Oracle Primavera P6, a high-performance project management software suite. It…

Data
.XLSB

Excel Binary Workbook

The XLSB file extension represents the Excel Binary Workbook format, which is a specialized spreadsheet format developed by Microsoft…

Data
.XLSM

Microsoft Excel Macro-Enabled Workbook

The XLSM file extension represents a Microsoft Excel Macro-Enabled Workbook. Introduced with the release of Microsoft Office 2007, it…

Data
.XLSX

Microsoft Excel Open XML Spreadsheet

The XLSX file format is the default spreadsheet format used by Microsoft Excel, starting with Excel 2007. It's based on the Open XML s…

Data
.XLTM

Microsoft Excel Macro-Enabled Template

An XLTM file is a macro-enabled template created by Microsoft Excel, the industry-standard spreadsheet application. Introduced with th…

Data
.XLTX

Microsoft Excel Open XML Spreadsheet Template

The XLTX file extension represents a Microsoft Excel Template file that was introduced with the release of Microsoft Office 2007. It i…

Data
.XMIND

XMind Workbook File

The XMind file format is a proprietary file format developed by XMind Ltd. specifically for their mind mapping and brainstorming softw…

Data
.XMIND-TEMPLATE

XMind Template

An XMind Template file, identified by the .xmind-template extension, is a specialized document format used by XMind, a popular mind ma…

Data
.XMT

Parasolid CAD Format (Text)

The XMT file extension is primarily associated with the Parasolid geometric modeling kernel, a world-leading 3D solid modeling engine…

Data
.XPT

SAS Transport File

The XPT file format, also known as the SAS Transport file format, is a platform-independent data format developed by the SAS Institute…

Data
.XSL

Extensible Stylesheet Language

XSL (Extensible Stylesheet Language) is a family of languages used for transforming and formatting XML (Extensible Markup Language) do…

Data
.XSPF

XML Shareable Playlist Format

XSPF (XML Shareable Playlist Format) is an XML-based playlist format designed for sharing and exchanging playlists between different m…

Data
.XYZ

Extensible Markup Language

XML (Extensible Markup Language) is a markup language designed for encoding documents in a format that is both human-readable and mach…

Data
.X_B

Parasolid Binary File

The .x_b file extension represents a binary file format used by the Parasolid geometric modeling kernel. Parasolid is a widely used so…

Data
.X_T

Parasolid Model Part

The .x_t file extension is associated with Parasolid, a geometric modeling kernel. These files contain 3D solid model data in a text-b…

Data
.X3D

Extensible 3D Graphics

X3D (Extensible 3D Graphics) is an open, royalty-free ISO standard for defining 3D computer graphics. It is the successor to VRML (Virtual Reality Modeling Lan…

Data
.XER

Primavera P6 Proprietary Exchange Format

The XER file format is a proprietary file format used by Oracle Primavera P6, a high-performance project management software suite. It is primarily used for ex…

Data
.XLSB

Excel Binary Workbook

The XLSB file extension represents the Excel Binary Workbook format, which is a specialized spreadsheet format developed by Microsoft as part of the Office sui…

Data
.XLSM

Microsoft Excel Macro-Enabled Workbook

The XLSM file extension represents a Microsoft Excel Macro-Enabled Workbook. Introduced with the release of Microsoft Office 2007, it is part of the Office Ope…

Data
.XLSX

Microsoft Excel Open XML Spreadsheet

The XLSX file format is the default spreadsheet format used by Microsoft Excel, starting with Excel 2007. It's based on the Open XML standard, which uses a com…

Data
.XLTM

Microsoft Excel Macro-Enabled Template

An XLTM file is a macro-enabled template created by Microsoft Excel, the industry-standard spreadsheet application. Introduced with the Office Open XML (OOXML)…

Data
.XLTX

Microsoft Excel Open XML Spreadsheet Template

The XLTX file extension represents a Microsoft Excel Template file that was introduced with the release of Microsoft Office 2007. It is based on the Office Ope…

Data
.XMIND

XMind Workbook File

The XMind file format is a proprietary file format developed by XMind Ltd. specifically for their mind mapping and brainstorming software. Structurally, an .xm…

Data
.XMIND-TEMPLATE

XMind Template

An XMind Template file, identified by the .xmind-template extension, is a specialized document format used by XMind, a popular mind mapping and brainstorming s…

Data
.XMT

Parasolid CAD Format (Text)

The XMT file extension is primarily associated with the Parasolid geometric modeling kernel, a world-leading 3D solid modeling engine developed by Siemens Digi…

Data
.XPT

SAS Transport File

The XPT file format, also known as the SAS Transport file format, is a platform-independent data format developed by the SAS Institute. It was specifically des…

Data
.XSL

Extensible Stylesheet Language

XSL (Extensible Stylesheet Language) is a family of languages used for transforming and formatting XML (Extensible Markup Language) documents. It\'s primarily…

Data
.XSPF

XML Shareable Playlist Format

XSPF (XML Shareable Playlist Format) is an XML-based playlist format designed for sharing and exchanging playlists between different media players and applicat…

Data
.XYZ

Extensible Markup Language

XML (Extensible Markup Language) is a markup language designed for encoding documents in a format that is both human-readable and machine-readable. It defines…

Data
.X_B

Parasolid Binary File

The .x_b file extension represents a binary file format used by the Parasolid geometric modeling kernel. Parasolid is a widely used solid modeling kernel devel…

Data
.X_T

Parasolid Model Part

The .x_t file extension is associated with Parasolid, a geometric modeling kernel. These files contain 3D solid model data in a text-based format. They are com…

Data

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.