File Extension FSA

.FSA File

File extension: FSA
File type: DNA and Protein Sequence Alignment


Notes about the FSA file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The FSA file type is primarily associated with 'FASTA Format'. FASTA is a DNA and Protein sequence alignment software package first described (as FASTP) by David J. Lipman and William R. Pearson in 1985 in the article Rapid and sensitive protein similarity searches. The original FASTP program was designed for protein sequence similarity searching. FASTA format files often have file extensions like .fa, .mpfa, .fna, .fsa, .fas or .fasta.

Detailed information for file extension FSA:


Primary association: FASTA Format
Identifying characters Hex: 3E , ASCII:
Related links: Wikipedia FASTA Page, Wikipedia FASTA Format Page

Other applications associated with file type FSA:

  • ABIF (Applied Biosystems Inc. Format) by Applied BiosystemsThe Applied Biosystems business is focused on basic research, commercial research (pharmaceutical and biotechnology) and standardized testing, including forensic human identification, paternity testing and food testing. The identifying characters used for this association are - Hex: 41 42 49 46 00 65 74 64 69 72 , ASCII: ABIF.etdir
File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

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