File Extension CER

.CER File

File extension: CER
File type: Internet Security Certificate File

Notes about the CER file extension:

To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The CER file type is primarily associated with 'Internet Security Certificate File'. In cryptography, a public key certificate (or identity certificate) is a certificate which uses a digital signature to bind together a public key with an identity. The certificate can be used to verify that a public key belongs to an individual. Canonical encoding rules (CER) are a restricted variant of Basic Encoding Rules for producing unequivocal transfer syntax for data structures described by ASN.1.

Detailed information for file extension CER:

Primary association: Internet Security Certificate File
Mime type: application/x-x509-ca-cert, application/pkix-cert, application/keychain_access
Identifying characters Hex: 2D 2D 2D 2D 2D 42 45 47 49 4E 20 43 45 52 54 49 46 49 43 41 54 45 2D 2D 2D 2D 2D , ASCII: -----BEGIN CERTIFICATE-----

Other applications associated with file type CER:

File Identifier - TrID
'Identifying characters' used on are
provided by Marco Pontello from his TrID database

To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension CER click this link to expand/hide the additional area.

System Info for File Extension .CER

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: CERFile, FileType: Security Certificate, AppName: Crypto Shell Extensions
EXEFile: cryptext.dll

ProgramID: certificatefile, FileType: Internet Security Certificate, AppName: Internet Control Panel

ProgramID: CERFile
EXEFile: %SystemRoot%\system32\rundll32.exe cryptext.dll,CryptExtOpenCER %1

ProgramID: CERFile
EXEFile: rundll32.exe cryptext.dll,CryptExtOpenCER %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\The Print Shop 20\tps.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\BRODER~1\PROFES~1\pppbl.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\BRODER~1\AGCREA~1\agccard.exe %1

ProgramID: CERFile
EXEFile: rundll32.exe %SystemRoot%\ServicePackFiles\i386\cryptext.dll,CryptExtOpenCER %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\PrintMaster 16\pm.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\The Print Shop 21\tps.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\BRODER~1\PRINTM~1\pmw.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\Scrapbook Designer\scrapbook.exe %1

ProgramID: PMWCertificateType
EXEFile: %ProgramFiles%\PrintMaster Platinum 17\PMW.exe

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