>> PA4 file

PA4 file format description

Many people share .pa4 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .pa4 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .pa4 files.

2 filename extension(s) found in our database.

.pa4 - Vector NTI Protein Archive

The PA4 data files are related to Vector NTI. The PA4 file is a Vector NTI Protein Archive. Vector NTI is a commercial bioinformatics software package.

Vector NTI
Data files
- / -
Vector NTI Protein Archive related extensions:
MySQL MyISAM Table Index Data
Intuit QuickBooks Journal Data
SageWorld Anti-Hacker Program Output
IBM HATS Connection Data
VisionWorks LS Image Sequence Data
PSP Theme Data

.pa3 - Turbo Pascal for DOS Source Code

The PA3 development files are related to Turbo Pascal. The PA3 file is a Turbo Pascal for DOS Source Code. Turbo Pascal is a software development system for the Pascal programming language running on CP/M, CP/M-86, and DOS, developed by Borland.

Turbo Pascal
Development files
- / -
pa4, pa5
Turbo Pascal for DOS Source Code related extensions:
Visual C++ Hint Data
Java Manifest File
Visual Basic OLE Type Library
Delphi MultiHelp Index
ParaView VTK Data File
Crestron SIMPL Program

Naturally, other applications may also use the .pa4 file extension. Even harmful programs can create .pa4 files. Be especially cautious with .pa4 files coming from an unknown source!

Can't open a .pa4 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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .pa4 file extension is often given incorrectly!

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

ap4, p4, p4a, pa, pae, par, pat

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Gimp Pattern
FactoryTalk View Studio Parameter Component File
Corel Paint Shop Pro Pattern
PC Stitch Pattern
SAP Portal Archive
CorelDraw Pattern

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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If you have useful information about the .pa4 file format, then write to us!