Drag and Drop is unable to automatically detect Librarian or Panvalet data sets, therefore when those data sets are displayed in a catalog search filter, you must manually set the type. The same is true for VSAM entry sequenced data sets and relative record data sets, unless your mainframe operating system is at a high enough level to support the integrated catalog facility calls.
Although Drag and Drop does not include support specifically for Innovation Access Method (IAM) files, you can download IAM files if you catagorize them as VSAM data sets.