You are using a macro to export? Have you considered VBA instead? I don't have the problem you describe, and I use VBA to do this.
In the VBA code, use Docmd.Transfer... The Help screen will basicly walk you through it.
With Send Keys though, use {Tab}{Enter}. Probably you already did this, but you said it doesn't work. I dunno why.
Chaz
Ascii dumb question, get a dumb Ansi