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[kudzu]

Where is FileCopy? VCL has many methods for file copy, all of which are well documented:

http://docwiki.embarcadero.com/CodeExamp...s_(Delphi)
Same applies for C++.

Otherwise check permissions and used account. If running as a service or IIS, network drives are not available as mapped letters unless that user has them mapped. Best to use UNC and make sure that user has permissions.