Use the ICIClientSettings interface GetHasMaxUploadSize method to determine if there is a maximum file size a user is allowed to upload. Refer to User Transfer Settings for an illustration of how this and other Client Settings Interface Methods and Properties can be accessed in the Administrator interface.
Signature:
HRESULT GetHasMaxUploadSize(
[out, optional] VARIANT_BOOL *pInherited,
[out, retval] long *pVal);