A daily updated filename extension database!

FAI file extension

The table below provides useful information about the .fai file extension. It answers questions such as:

  • What is the .fai file?
  • What program do I need to open a .fai file?
  • How can the .fai file be opened, edited or printed?
  • How can I convert .fai files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ FASTA Index Data

FAI file is a FASTA Index Data. In bioinformatics, FASTA format is a text-based format for representing either nucleotide sequences or peptide sequences, in which nucleotides or amino acids are represented using single-letter codes.
Category: Data files
Application: Samtools
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
FAI aliases:
FAI related links:
FAI related extensions:
FASTA Sequence

GCG DNA Sequence

GenBank Data

Quality Score File

FASTQ Sequence

Mauve eXtended Multi-FastA Data

Mauve Alignment Data

Other types of files may also use the .fai file extension.

🚫 The .fai file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

afi, vai, rai, fia, fau, fak, cai, ai, tai, gai, fi, fal, dai, bai

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

AOMEI Backupper Backup Archive
SPEFO Stellar Spectra Analysis Data
Creator Collapsed Fault List
Adobe Illustrator Drawing
Nvidia Texture Atlas Tool Texture Data
Fortran Interface File
Bank Administration Institute Data File
PhotoDub Document.
Gforth Image File
SeeYou Flight Data

🔴 Can't open a .fai file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .fai file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .fai file extension, write to us!

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