You can prevent specific files or folders from being compressed by using a global exclude. When you use a global exclude, the types of files or folders that you select remain uncompressed for all users.
To exclude files and folders from compression
On the Compressed Files tab, do any of the following:
To exclude all files greater than a specific size from compression, check the Exclude all files greater than check box and enter a size in KB.
To Add a new compressed file global exclude, click Add, and then configure as follows: