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PSI file extension

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

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

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

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

✅ Affymetrix Probe Set Information

PSI file is a Affymetrix Probe Set Information. The PSI file contains the probe set names and number of probe pairs for expression and genotyping arrays. This information is also stored in the CDF file and in the same order.
PSI format description not yet available
Category: Data files
Application: Affymetrix Genechip
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
PSI aliases:
PSI related links:
PSI related extensions:
Affymetrix Gene Information Library

Affymetrix Chip Description File

Affymetrix Probe Array Results File

Affymetrix Probe Array Results File

Affymetrix Experiment File

Affymetrix Image Data File

Affymetrix Grid Control File

Affymetrix Mask File

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

🚫 The .psi file extension is often given incorrectly!

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

lsi, osi, pci, pei, pi, pis, pqi, ps, psj, psk, psl, pso, psu, pwi, pxi

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Osiris Data
ETCBC Phrase Structure Data
PSCAD Power System Simulation Library
PowerTerm Power Script
Pocket Word Document
SAP Business Objects Local Security Information File
iPi Calculation Data
PhreeqcI Data
LightScribe Image File

🔴 Can't open a .psi 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 .psi 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 .psi file extension, write to us!

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