Can't find a renamed file using Applescript

Question

Here is what I'm trying to accomplish:
1) User selects .csv file
2) Finder duplicates file and renames as a txt file
3) Microsoft Excel imports this newly made file as a pipe delimited text file with text formatting in all cells (On a Mac, Excel won't take pipe delimited csv's, it automatically assumes they are comma delimited)
4) Microsoft Excel then saves this as the same name of the original user extraction location with the same name but in the .xlsx or XML format
Preferably with that duplicated file now gone, whether its used and converted with Excel, or later deleted from Finder.
Here's the code that I'm working with so far:
on run
          set csvfile to (choose file) as alias
          tell application "Finder" to set tempname to (name of csvfile as text) as text
--display dialog "" & tempname
          tell application "Finder"
                    set theDupe to duplicate csvfile
                    set name extension of theDupe to "txt"
          end tell
          tell application "Microsoft Excel"
  open text file filename theDupe data type delimited field info {{1, text format}, {2, text format}, {3, text format}, {4, text format}, {5, text format}, {6, text format}, {7, text format}, {8, text format}, {9, text format}, {10, text format}, {11, text format}, {12, text format}, {13, text format}, {14, text format}, {15, text format}, {16, text format}, {17, text format}, {18, text format}, {19, text format}} other char "|" with use other
                    set theworksheet to worksheet 1 of active workbook
  save as theworksheet filename tempname file format Excel XML file format with overwrite
          end tell
end run
The error I run into is that after it duplicates and renames the file, it is trying to refer to something that it can't find.
Please I'm stuck at this point, any suggestions or helpful hints??

Answer 1

This actually works, I just need to rename "theDupe" file at the end to take off the " copy"
on run
          set csvfile to (choose file) as alias
--tell application "Finder" to set parentFolder to container of file csvfile
--tell application "Finder" to set tempname to (parentFolder as string) & (name of csvfile as text)
--display dialog "" & tempname
          tell application "Finder"
                    set theDupe to (duplicate file csvfile) as alias
                    set name extension of theDupe to "txt"
  --display dialog theDupe as string
          end tell
          tell application "Microsoft Excel"
  open text file filename (theDupe as string) data type delimited field info {{1, text format}, {2, text format}, {3, text format}, {4, text format}, {5, text format}, {6, text format}, {7, text format}, {8, text format}, {9, text format}, {10, text format}, {11, text format}, {12, text format}, {13, text format}, {14, text format}, {15, text format}, {16, text format}, {17, text format}, {18, text format}, {19, text format}} other char "|" with use other
                    set theworksheet to worksheet 1 of active workbook
  save as theworksheet filename (theDupe as string) file format Excel XML file format
          end tell
--tell application "Finder" to delete file (theDupe as string)
          tell application "Finder" to set name extension of theDupe to "xlsx"
end run