Cisco TFTP backup occasionally creating .tmp files

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http://serverfault.com – We are backing up our ASAs and switches using some scripting. It works very well. I have noticed though, occasionally, the backups to the TFTP will come out not as plain "files" with no extension, rather .tmp files. Curious as to the cause. I have manually confirmed, the .tmp files have always been identical in size and content of then manually backed up non-.tmp files of the same backed up device. Why does this happen? Any way to prevent it? Is there any reason to care? It seems to happen completely at random and immediately upon creation (I have tried enabling longer sleep statements in th (HowTos)