The File Extensions Database


.CUID2 File Extension

  • Category: Mobile phones related Files

What is an .CUID2 file?

.CUID2 is Baidu.cuid2 data

The cuid2 file extension seems to be related to a baidu.cuid2 file found on certain Android devices in Baidu folder.

It appears to be generated by some app related to the Chinese Baidu service, but there also seems to exist a spyware called Baidu.

Can be safely deleted.


How to open:

Probably not meant to be accessed by the user.

How to convert:

Probably cannot be converted to anything else.

How to solve problems with CUID2 files

  • Associate the CUID2 file extension with the correct application. On :
    Windows: Right click on any CUID2 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CUID2 files". Mac: Right click (or Ctrl-click) the CUID2 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 .CUID2 is Baidu.cuid2 data. Because only the current version supports the latest CUID2 file format. Search, therefore, e.g. on the manufacturer website after an available .CUID2 is Baidu.cuid2 data update.
  • To make sure that your CUID2 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.