.XLTX file extension

To open .XLTX files on Windows, double-click the .xltx file to open it in Microsoft Excel.

To open a .xltx file, use Microsoft Excel (it’s an Excel template format in the Office Open XML family). When you open it, Excel typically creates a new workbook based on the template rather than editing the template directly.

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Last updated: June 12, 2026

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .XLTX files

Use these platform-specific instructions to open .XLTX files safely.

Windows

Double-click the .xltx file to open it in Microsoft Excel.
If it opens in the wrong app: right-click the file → Open with → Excel (or Choose another app) → optionally set Excel as the default.

Full Windows guide

Mac

Double-click the .xltx file to open it in Microsoft Excel for Mac.
If prompted, choose Excel as the application to open the file and confirm.

Full Mac guide

Linux

If your Linux desktop recognizes the file, it may associate .xltx with the OOXML spreadsheet template MIME mapping (via shared-mime-info); try opening it from your file manager.
If you do not have compatible spreadsheet software installed, transfer the file to a system with Microsoft Excel to use the template reliably.

Full Linux guide

iOS

Open the .xltx from the Files app and choose Microsoft Excel if installed; the template should create a new workbook based on it.

Full iOS guide

Android

Tap the .xltx in your file manager or email attachment and open it with Microsoft Excel if installed; it should generate a new workbook from the template.

Full Android guide

Security notes

.xltx is the non-macro OOXML template type; macro-enabled templates are a different extension (commonly .xltm). If you expected macros, verify you received the correct file type.
Even without macros, .xltx is a complex packaged document format (OOXML/SpreadsheetML). Treat templates from unknown sources cautiously because malformed document packages can sometimes trigger application parsing issues.
Be careful when templates contain links or connections to external data sources: opening a workbook generated from a template may prompt to update links or retrieve external content, which can leak information or pull untrusted data depending on your settings.

If you did not expect this file

This extension is usually plain data, text, or structured content—not a program by itself. The practical risk is social engineering (a scam attachment or misleading filename). For trusted senders you rarely need heavy-handed antivirus wording; use these tools when you want an extra check on unexpected downloads.

Avast

Avast offers free and premium antivirus software that protects against viruses, malware, ransomware, and phishing. Scan files before opening them to ensure safety.

Norton

Norton 360 delivers comprehensive antivirus protection, VPN, and identity theft monitoring. Scan files for threats before opening to keep your device secure.

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Can't open this file?

These are the most common causes and fixes when .XLTX files fail to open.

Common reasons

Opening the template creates a new workbook instead of letting you edit the template
File won’t open or reports corruption
It opens in the wrong application

Fix steps

In Excel, use File → Open to open the template, then use File → Save As to save your changes back as a template (.xltx) if you intend to update the template itself.
If you only need a normal spreadsheet based on the template, save the newly created workbook as a regular Excel workbook (for example, .xlsx) with a new name.

OS-specific troubleshooting

What is a .XLTX file?

.xltx is an Office Open XML SpreadsheetML template format used by Microsoft Excel. Technically it is an OOXML package containing XML parts that describe workbook structure, worksheets, styles, and related resources as defined by the OOXML/SpreadsheetML packaging model.

Background

.xltx is the modern Excel template format used for distributing reusable spreadsheet designs—things like standardized report layouts, invoice templates, dashboards, or any workbook with preconfigured formatting and structure. Instead of starting from a blank workbook, users open a template to generate a new workbook with the template’s content and settings already in place.

The format belongs to the Office Open XML (OOXML) specification family standardized in ECMA-376. SpreadsheetML documents are stored as a packaged set of parts (XML files and related resources) that together describe the workbook, sheets, styles, and other elements.

In practical use, .xltx is preferred over older template formats when you need an interoperable OOXML-based template. It is distinct from macro-enabled templates (commonly .xltm): .xltx is the non-macro OOXML template variant.

Common MIME types: application/vnd.openxmlformats-officedocument.spreadsheetml.template

Common .XLTX issues

Opening the template creates a new workbook instead of letting you edit the template

.xltx is a template format; spreadsheet apps often treat it as a blueprint and create a new workbook from it when opened.

In Excel, use File → Open to open the template, then use File → Save As to save your changes back as a template (.xltx) if you intend to update the template itself.
If you only need a normal spreadsheet based on the template, save the newly created workbook as a regular Excel workbook (for example, .xlsx) with a new name.

File won’t open or reports corruption

.xltx is an OOXML package of multiple parts; if the package or any required XML part is damaged, Excel may fail to open it or warn about repairs.

Re-download or re-copy the file (corruption often happens during transfer or incomplete downloads).
Try opening it in Microsoft Excel and allow repair if offered, then immediately Save As a new file name.

It opens in the wrong application

Operating system file associations can be set incorrectly, especially if multiple office suites are installed.

Windows: right-click → Open with → Excel → set as default if desired.
macOS: select the file in Finder → Get Info → Open with → choose Excel → Change All.

FAQ

What is an .xltx file used for?

It’s an Excel template: you open it to create a new spreadsheet that starts with predefined sheets, formatting, and settings.

Is .xltx the same as .xlsx?

No. Both are OOXML SpreadsheetML-based, but .xltx is intended as a template. Opening it usually produces a new workbook based on the template rather than editing the template directly.

Can .xltx contain macros?

.xltx is the non-macro OOXML template type; macro-enabled Excel templates use a different OOXML extension (commonly .xltm).

What MIME type is associated with .xltx?

The IANA-registered media type for OOXML spreadsheet templates is application/vnd.openxmlformats-officedocument.spreadsheetml.template.

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