Data Export Macro works in Excel 2013 but not Excel 2007

I have a macro that creates a new workbook, copies some data from the source book, pastes into the newly created book, then saves that new book and closes it. This code works PERFECTLY in Excel 2013, but does not function in Excel 2007. It breaks on the line indicated in my code below with the 1004 error: Method 'SaveAs' of object '_Workbook' failed

The code in question:

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My guess is that it has to do with the fact that I have a variable file format, but this is required given that the user needs to be able to save as either a CSV or tab delimited text, depending on the application.

Like I said, this code runs perfectly in Excel 2013. Some computers at my place of business however use older versions of office, 2007 being common, and this doesn't want to function on those older versions. Any idea how I might be able to modify this code to enable it to run on older versions of Excel (at least as old as 2007) as well?

Many thanks!

I'm such an idiot. The problem actually has nothing to do with Excel 2013 vs 2007. The computers that are running Excel 2007 have no user login as they are a shared resource, and the name given to the windows account has a "." in it! That was throwing off the InStr calculation in this step:

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Once I recognized that, simply changing the function from InStr to InStrRev fixed the problem!

I appreciate all your input though. Thanks!