First, is your data encrypted? If so, we can't read it. If your data have been written with encryption, you must use SAS to copy the file to an unencrypted format.
If you still cannot read your file, please report the error using the mechanism on the Log tab of the user interface. The SAS file format has not been publicly documented and there may be aspects of it that we are not supporting properly. Please let us know about any problems you are having so that we can fix them for you and others.