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Internet security certificate
File type: Email attachment blocked file, Internet related file
Files with crt suffix can be usually found as Internet security certificates in a well known and supported standard.
Found 4 different file type records with the same crt filename suffix.
File type category:
Email attachment blocked file
Internet related file
Date updated: June 27, 2025
File extension crt is frequently used for Internet security certificates. Server, web site transactions, logins, webmail and connections are usually secured with a SSL Certificate.
One of the most used certificate formats is the X.509v3. The standard known as ITU-T X.509 (formerly CCITT X.509) or ISO/IEC 9594-8, which was first published in 1988 as part of the X.500 Directory recommendations, defines a standard certificate format. The certificate format in the 1988 standard is called the version 1 (v1) format.
MIME types used:
application/x-x509-ca-cert
application/pkix-cert
application/keychain_access
application/x-x509-user-cert
Opening a certificate usually prompts you to install it to your system. Be careful when installing unknown certificates.
Certificates are not meant ot be converted to anythin else.
Microsoft Edge (Microsoft Windows)
Opera browser (Microsoft Windows)
Firefox (Microsoft Windows)
Google Chrome (Microsoft Windows)
Safari for Microsoft Windows (Microsoft Windows)
Opera browser for Mac (Apple macOS / Mac OS X)
Firefox for Mac (Apple macOS / Mac OS X)
Google Chrome for Mac (Apple macOS / Mac OS X)
Safari (Apple macOS / Mac OS X)
Opera browser for Linux (Linux/Unix)
Firefox for Linux (Linux/Unix)
Google Chrome for Linux (Linux/Unix)
Microsoft Edge (Microsoft Windows)
Opera browser (Microsoft Windows)
Firefox (Microsoft Windows)
Google Chrome (Microsoft Windows)
Safari for Microsoft Windows (Microsoft Windows)
Opera browser for Mac (Apple macOS / Mac OS X)
Firefox for Mac (Apple macOS / Mac OS X)
Google Chrome for Mac (Apple macOS / Mac OS X)
Safari (Apple macOS / Mac OS X)
Opera browser for Linux (Linux/Unix)
Firefox for Linux (Linux/Unix)
Google Chrome for Linux (Linux/Unix)
File type category:
Emulator file
Date updated: October 23, 2017
The crt file extension is associated with some emulators of Commodore computers like, CCS64 for Microsoft Windows etc.
The crt file stores image of a cartridge, tape or disk from Commodore computers.
The crt files are used for internal purposes of Commodore emulators.
CCS64 (Microsoft Windows)
CCS64 (Microsoft Windows)
CCS64 (Microsoft Windows)
File type category:
Settings, options, themes or skins file
Date updated: May 16, 2019
The crt file extension is associated with the Oracle Database, a relational database management system and some other apps developed by Oracle.
The crt file stores terminal settings information data.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Oracle Database (Multiplatform)
File type category:
Various data file
Date updated: August 21, 2018
The crt file extension is associated with the Unix based operating systems.
cron is a Unix, Solaris utility that allows tasks to be automatically run in the background at regular intervals by the cron daemon.
These tasks are often termed as cron jobs in unix , solaris. Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Unix (Linux/Unix)
Solaris (Other operating systems or devices)
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