I am trying to create a tab delimited text file.

I am creating a text file with CreateTextFile with a .txt extension:
Set fs = CreateObject("Scripting.FileSystemObject")
Set a = fs.CreateTextFile(textfilename & ".txt", True)

I create a variable which holds my tab character:
tabchar = Chr(9),

then I insert the variable in between fields,
I use WriteLine to write each record to the file:
a.WriteLine(field1 & tabchar & field2 & tabchar &.......& tabchar & fieldn)

It seems to be working right, but when I try to use the file to import into other programs, sometimes the tabs aren't recognized.
any ideas?
thanks for your time,
Ryan