TFS puts the documents files an which path? i can't find anywhere

or it puts the all documents in the Sqlserver database ?

Yes, as Nima says, everything is on the Sql Server, you have the Sps database with all the lists and documents you upload to the Sharepoint site of each project, and also another different database for Source Control files.

There is also the database with WorkItems and documents attached to them

Thank u for all U.

I found the table Docs in the Database STS_Content_TFS and the infomation about all docs are in this table

The [Content] column records the content of the doc in binary. So it can be read and resave.