Just a clarification, the encrypted content store is an enterprise-only feature. So, if you are using Community Edition, files do not get encrypted when they are stored in the content store directory. although they do get their name changed.
If you look in the node browser you can see where in the content store your file resides. If you have access to the content store, you can copy the file to another machine and rename it. It will be exactly as it was when it was uploaded.
If that is a concern you must use an encrypted content store along with Enterprise Edition.
> "although they do get their name changed." > "you are using Community Edition, files do not get encrypted when they are stored in the content store directory." Does it mean there is no encryption process in Community Edition? If it is the case, what process makes their content filename changed?