Can't open Excel File manually after MS Project has opened it via VBA

Question

I was testing a section of code I got from a forum that opens a Excel Workbook via MS Project VBA so that I could use it to update a Excel Workbook that I have. The macro opens the Workbook as intended but the main problem I'm encountering is that
after I've run the macro, saved and closed the Workbook again, I'm unable to open it manually either from Recents or directly from folder location. I'm using Project 2010 (non Server) and Excel 2010 - Windows 7.
I'm also having trouble getting it to select "Sheet2" of the Workbook when it opens so I've Commented it out, but it would be a bonus if someone could shed some light on that one as well.
Edit: I worked out how to select the Sheet...I've updated the code Below. 
Sub OpenTest()
Dim xlApp As Excel.Application
Dim xlWkb As Excel.Workbook
Set xlApp = CreateObject("Excel.Application")
Set xlWkb = xlApp.Workbooks.Open_ ("C:\Users\myName\Desktop\Export Test1.xlsx")
xlApp.Visible = True
xlApp.Sheets("Sheet2").Select
Set xlWkb = Nothing
End Sub
Thanks!
Matt

Answer 1

Matt,
Actually your macro code works fine and I can re-open the file without problem.
I don't recall asking in your other post but do you have SP2 installed for Project 2010? And, do you have SP2 installed for Office 2010, which will cover Excel? They are separate updates. It would also be a good idea to install the June 2013 cumulative update
for Project 2010 as it was released after SP2 and it does fix some VBA issues as I recall.
As I indicated, your code works fine on my PC which is also Project 2010, Office 2010 and Windows 7. Try this. After you run the macro and then save and close the workbook, does Excel also get closed automatically? If it does, (and it should), after you
close the workbook, take a look at the applications manager to see which Windows applications are currently running. Does Excel still show up?
John