A 128 MB file is typically too large for standard email attachments (which usually cap at 20–25 MB). To share it, use one of these cloud services:

If the file is just over the limit, try zipping it (right-click > Send to > Compressed folder) to reduce the size slightly.

What specific are you working with, or are you trying to free up space on a specific device? Fix SD Card Not Showing Full Capacity (Windows Tutorial)