What is a PEP file?
A .PEP file is a data file that can belong to several different software programs. The most common use is a Process Engine workflow definition created for the IBM FileNet Process Engine. These specific files use the standard XML format to define business processes.
However, a .PEP file can also serve other purposes. It might be a 3D pose data file for Celsys PoseStudio, a construction project data file for RIB Software, or a peptide sequence FASTA file used in bioinformatics software like MaxQuant. Additionally, a .PEP file can be a TurboProject Project File created by Office Work Software.
How to open PEP files?
Because the .PEP file extension has multiple possible meanings, you must first identify the correct format. If the file is an XML workflow definition, you can open it with any basic text editor or IBM FileNet. If the file is a construction project data file, it is actually an encrypted ZIP archive. You can extract these archives using standard decompression tools like WinRAR. Bioinformatics peptide files can be opened using MaxQuant or any text editor.
Best practices and troubleshooting
Do not rename the .PEP extension to try and force a file to open. If you do not know the source of your .PEP file, you can inspect its contents with a hex editor. This will reveal if the file starts with XML text, a ZIP archive signature, or plain text FASTA data.
Summary
viewer.online/pep analyzes .PEP files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. Because .PEP files use the known XML format or standard ZIP compression, viewer.online/pep can safely open and display them online, eliminating compatibility problems.