VB copy file issue. Not ahmi specific

[g.mccormick]

This is not a ahmi specific question, but I am attempting to copy a log file to a destination.  I get an error for the path, but I cannot figure out what the issue is.  Any help would be appreciated.
See pic

[georgegraz]

Can't see filename, but my problem a couple of weeks ago is this:
g:\_Filename.csv   didn't work
g:\Filename.csv does
George

[Godra]

   My.Computer.FileSystem.CopyFile(foundFile, My.Computer.FileSystem.SpecialDirectories.Desktop & foundFile.Substring(foundFile.LastIndexOf("\")))

[g.mccormick]

   My.Computer.FileSystem.CopyFile(foundFile, My.Computer.FileSystem.SpecialDirectories.Desktop & foundFile.Substring(foundFile.LastIndexOf("\")))

Thank you Godra.  That worked perfectly. Can you explain the what/why? 

[Godra]

Look at the bottom left of your picture. It shows the "foundFile" value as the whole path and not only the file name.