This base64 string returned from
your MimeEncode function. Initialy I load data this way:
TBlobField(LocalQuery.FieldByName('SegmentCriteria')).SaveToStream(MyResultRecord.NewByteStream('SegmentCriteria'));
And same base64 string returned by delphi's TNetEncoding.Base64.Encode and any online base64 encoder in Internet.
Here is original binary data file wich converted to base64:
https://drive.google.com/file/d/0B2yvbcYNT3ubZE1tUTJMbUJMd1U/viewDownload it and convert to base64 using your Mime encoding routines, delphi RTL routines or using any online base 64 converter like this
http://base64-encoding.online-domain-tools.com/or this
http://www.motobit.com/util/base64-decoder-encoder.aspand you got same string: /v///wABAAAAAERYVUZNVAYEAAAAegB6ADEAJQABAAAABQAAAEUAbQBhAGkAbAASBAAAAHoAegAxACUA
So, it's MUST be valid !