Classic ASP file upload limit of 200kb in IIS 7L
In IIS 7, click your site and expand it then click the ASP icon.
Source: Amixa Blog
Expand the Limits Properties icon, and change the value in the “Maximum Requesting Entity Body Limit” to a value larger than 200000 (which is about 200kb). 2000000 would be roughly 2mb, 20000000 would be 20mb.