is the PE format of vc++ 6.0 executables different from vb(.net and 6.0)

When I try to get the IMAGE_IMPORT_DESCRIPTOR from a vc++ 6.0 executable, the win32 dll being used by the exe is in the IMAGE_IMPORT_DESCRIPTOR. But when I use vb(.net or 6.0) exe, the win32 dll being used(or called within the vb application) is not in the IMAGE_IMPORT_DESCRIPTOR. Note: I get the IMAGE_IMPORT_DESCRIPTOR structure by using ImageDirectoryEntryToData() and I use the module handle of the exe itself as one of its parameters.