Users of TFS are used to have the 4MB attachment limit, what they don’t know that instead of complaining about that they can change the limit up to 2GB in a few simple steps.
Step 1: Log-in to the TFS machine using an administrator account (Local Administrator).
Step 2: Surf using the browser to: http://localhost:8080/WorkItemTracking/v1.0/ConfigurationSettingsService.asmx?op=SetMaxAttachmentSize
Step 3: In the maxSize text box enter the new size limit in bytes.
For example to have 10MB limit you need to type: 10485760 Bytes
Step 4: Click the “Invoke” button.
Important thing to know is that this change is global and will affect all the TFS projects and users.