This file isn't available anymore for .TXT files

Hi everyone,

I am currently working on some project for a client, and I need to create a file (.txt) that contains some text.

I was currently doing something like this to create the file to an object:

// Generate the file
ContentVersion file = new ContentVersion();
file.Title = fileDisplayName; // Display name of the files
file.VersionData = Blob.valueOf(content); // converting you
file.PathOnClient = fileName; // Name of the file
insert file;
// Link the file to the object
ContentDocumentLink link = new ContentDocumentLink();
link.ContentDocumentId = [SELECT ContentDocumentId FROM ContentVersion WHERE Id = :file.Id].ContentDocumentId; // Get the ID of the associated ContentDocument
link.LinkedEntityId = id;
link.ShareType = 'V'; // V specify this document is visible to all users, use I for internal users only
insert link;

But during my tests I found something strange:

- the file is created and attached to the object in the File category (like expected)

- I can download it

- I can see a miniature of the content of my file (so Salesforce is able to read its content)

But I am not able to visualize it Salesforce (see screen bellow)

Do you have an idea of why I can't preview .txt files in salesforce even if Salesforce is able to read it ?