Files with cuid file extension can be often found on Android devices and appear to be related to Baidu service.

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CUID file extension - Baidu.cuid data

What is cuid file? How to open cuid files?

File type specification:

Mobile phones related file type icon Mobile phones related file type

The cuid file extension seems to be related to a baidu.cuid 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.

Help how to open:

You probably cannot access this file manually, it may be used in some app installation for Baidu.

How to convert:

It is unlikely that this file type can be converted to anything else.

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