IE Tries to Download Json Response

Apparently, IE 8 and below doesn't like "application/json" mime type in ajax response. When it receives the response, it tries to download it as a file, and prompts a "Save as" dialogue. Although the standard json mime type is "Application/json", you need to use "text/plain" to fix this issue, So if you are using .Net MVC you need to use:
return Json(result, "text/plain");

Where "result" is the object you want to convert to Json.

Important: Do not use "text/html", it creates an XSS flaw in your application. See here for more info

Regex For Matching File Names with Date

Here is some example of file name matching regex:

File Format:

FileName-dd-mm-yyyy.EXT:
^(FileName)-([1-9]|0[1-9]|[12][0-9]|3[01])-([1-9]|0[1-9]|1[012])-(19[0-9][0-9]|20[0-9][0-9])\.EXT$

See here for a good reference: http://msdn.microsoft.com/en-us/library/az24scfc.aspx
Also you can test your expression here: http://www.regextester.com/