FCGI file format description

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

1 filename extension(s) found in our database.

.fcgi - FastCGI Application

The FCGI application files are related to FastCGI. The FCGI file is a FastCGI Application. FastCGI is a binary protocol for interfacing interactive programs with a web server. FastCGI is a variation on the earlier Common Gateway Interface (CGI).

Application files
- / -
FastCGI Application related extensions:
Compiled Fast-Load AutoLISP
Nintendo Switch Executable
LunarCell Photoshop Plug-in
TWAIN Data Source
Windows Script Component File
EDIUS Plugin

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

Can't open a .fcgi 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 .fcgi file extension is often given incorrectly!

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

cgi, fcg, fci

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Common Gateway Interface
RAD Studio CodeGuard Configuration
FastCGI Application
GAUSS Engine Compiled Gauss Data
Erosion 3D Inflow Table
Fiery Clone Tool Image

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.


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

DataTypes.net >> FCGI file