apache+php win2003 4G cannot find files exceeding 20M

Question

Server win2003 4G

web: XAMMP, or phpstudy, apache php5.4

Upload can upload files of any size normally (the settings have been modified in PHP.INI)

Cannot download files exceeding a certain size. Copy a file to the web directory. When accessed by the browser, it prompts a network error. Unable to find

. In the same server IIS, the same file can be accessed by the browser. %E