Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Wave file textures are fx_swoosh and fx_swoosh2 in your FSX/Effects/texture folder.
I'd check the dates modified/created on them (in case something has altered them) and then I'd try loading these into DXTBMP to see if they load OK.
Then I'd check the dates on the fx_waves.fx file in the FSX/Effects folder to make sure it hasn't been overwritten.