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.FLT file extension

To open .FLT files on Windows, right-click the .FLT file and select 'Open with'.

.FLT files are document files that require specific applications to open. Use compatible software for your operating system to access them.

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Last updated: June 11, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page
  • Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
  • Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
  • Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
  • Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
  • Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

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

How to open .FLT files

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

Windows

  1. Right-click the .FLT file and select 'Open with'.
  2. Choose a compatible application like OpenFlight or a GIS software.
Full Windows guide

Mac

  1. Control-click the .FLT file and select 'Open With'.
  2. Choose an application that supports .FLT files, such as a GIS viewer.
Full Mac guide

Linux

  1. Right-click the .FLT file and select 'Open with'.
  2. Use a compatible Linux application like a GIS tool or viewer.
Full Linux guide

iOS

  1. Open the .FLT file in the Files app.
  2. Use 'Share' to send it to a compatible app if needed.
Full iOS guide

Android

  1. Locate the .FLT file in your file manager.
  2. Open it with a compatible Android app that supports .FLT files.
Full Android guide

Security notes

  • Always verify the source of the .FLT file before opening.
  • Keep your software updated to protect against vulnerabilities.
  • Avoid running any embedded scripts unless you trust the source.

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.

We may earn a commission when you use affiliate links. This supports our free file extension guides.

Can't open this file?

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

Common reasons

  • FLT file does not open
  • File opens with incorrect application

Fix steps

  1. Ensure a compatible application is installed.
  2. Check that the file is complete and from a trusted source.
  3. Try opening the file with another application.

OS-specific troubleshooting

Convert .FLT to other formats

Use conversion tools to change .FLT files into formats your software supports.

What is a .FLT file?

.FLT is a document file format used by specialized applications, often in industries like simulation or geographic information systems. These files can contain complex data structures and are not typically meant for general document viewing.

Background

.FLT files are often associated with applications that handle complex data, such as flight simulation or geographic information systems. The format may include 3D models, simulation data, or other specialized content. While not as common as other document formats, it serves crucial roles in industries requiring detailed and precise data representation. Users may encounter .FLT files when dealing with professional software suites or when exchanging data in specific technical fields.

Common MIME types: text/vnd.ficlab.flt

Further reading

Authoritative resources for more details on the .FLT format.

Common .FLT issues

FLT file does not open

The file may not open if the necessary software is not installed or the file is corrupted.

  1. Ensure a compatible application is installed.
  2. Check that the file is complete and from a trusted source.
  3. Try opening the file with another application.

File opens with incorrect application

The operating system may associate the file with the wrong application.

  1. Right-click the file and select 'Open with'.
  2. Choose the correct application and set it as default.

FAQ

Can I convert a file to .FLT by renaming it?

No, renaming does not convert the file. Use a conversion tool instead.

Is it safe to open .FLT files?

Yes, if the file is from a trusted source and opened with reputable software.

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