From file guid, how can I know if a file is a "cfile" file ?

[Gilbertdelyon]

Context:
I have a custom module with some actions when a file is downloaded.
I need to know if the downloaded file is managed by cfile.

The way I do:
Get file guid from request parameters:
$fileguid = Yii::$app->request->get('guid')
Then query in db 'file' table to get the file id
Then query in db cflies_file table and check if the id is in the table.
If the id is in the table it means that it's a "cfile" file.

Issue:
Some times it works, some times it doesn't.
This is because a lot of files that are referenced in folders are not in the "cfiles_file" table.
It seems that only "old" files are in the table but not new files.
When I browse in the folders, all files are present and download counter is updated. But I cannot find counter value of new files in db
So I worry about the way it works.

Questions

• Please, how does it work?
• From de file guid, is there a simple way to check is the file is a "cfile" file?

Thank you in advance for your comments

[Gilbertdelyon]

In the meantime I found that I was on the wrong way (newbee error). I need to use object_id. from file table and compare with id in cfile-file table