Change PowerPoint links to Excel workbooks with VBA

I have a presentation with a number of links to Excel workbooks/sheets. I can get to these through Edit... Links... and change them one at a time. I need to change the location of the workbooks, so I'd like to do them all at once programmatically. The tricky part here is that the filenames contain ranges, not just an Excel workbook name.

I tried replacing just the directory spec using something like this:
   .LinkFormat.SourceFullName = newPath & oldXLFN

I get an error message that says I can't do this because the filename is already open. I'm supposing that when I open the PPT presentation, that the links are then opened at the same time.

Is there some easy way to make this directory change in VBA? Each presentation has about 15 links and we have a number of presentations to update.

Thanks in advance for the help.
Tom
thomasedooleyAsked:
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thomasedooleyAuthor Commented:
I think I found the problem. All day yesterday I was trying this, and getting the message that said "you already have a copy of this file open" as I stated above.

When shutting down my machine before going home, I got a spurious "do you want to save the changes made to thisfile.xls" from Excel (which was the linked Excel file I'm using in the PPT).

I tried this again this morning, and lo and behold, the code works (.linkformat.sourcefullname).

We can close this as solved by me, or delete it.

I appreciate the work put in by any experts on this problem, and would happily give points.

thanks
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