Loop Through Folder, Run Macro On All Files

I am trying to process 60+ data files. I've recorded/written macros that do all of the processing, and now I would like to write a loop that will go through a folder with the data files (.txt, tab delimitted), and run the code on each file. I am using the Mac Version of Excel 2004. I have tried to adapt some code that I found in the forums, but after fixing a few errors, now nothing is happening when I run the code. The code is below. I have it in a module in the VBA editor.

length of the code; I'm assuming the problem is in the very beginning or end (the code I added for the loop), as the code in the middle that does the actual processing works.

Sub ProcessData()

Dim strDocPath As String
Dim strCurrentFile As String

strDocPath = "Macintosh HD"":Users:thomasarmstrong:Desktop:SF08_Macrosv2:Loop_test:directory:"
strCurrentFile = Dir(strDocPath & MacID("TEXT"))