The File Extensions Database

.REQ File Extension

  • Developer by: Canon
  • Category: Misc Files

What is an .REQ file?

.REQ is Canon SD Card Version Request File

Empty file sometimes stored on Canon digital camera SD cards; saved with the filename ver.req and used for reporting the firmware version on the camera when the user holds the FUNC/SET button and presses the DISP button.

You can manually create the ver.req empty file by saving a blank document in Microsoft Notepad and renaming the filename to ver.req.

Programs that open Canon SD Card Version Request File
Microsoft Notepad
File Type 2 SSL Certificate Request File
Category: Misc Files

A REQ file is a file used in the process of setting up a digital certificate. It stores a Certificate Signing Request (CSR), which includes information that uniquely identifies the initiator of the request. REQ files are sent to trusted entities (certificate authorities) who use the requests to generate valid digital certificates for the requesters.

CSRs are used in the process of public key cryptography, which is used to validate identities on the Internet. Digital certificates validate the authenticity of a company or merchant online so users or customers can know that the website is trustworthy and secure.

Programs that open SSL Certificate Request File
Microsoft Exchange Server

How to solve problems with REQ files

  • Associate the REQ file extension with the correct application. On :
    Windows: Right click on any REQ file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.REQ files". Mac: Right click (or Ctrl-click) the REQ file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .REQ is Canon SD Card Version Request File. Because only the current version supports the latest REQ file format. Search, therefore, e.g. on the Canon manufacturer website after an available .REQ is Canon SD Card Version Request File update.
  • To make sure that your REQ file is not corrupted or virus-infected, get the file again and scan it with antivirus software.