I have copied exported site to another farm and tried to restore. After executing of cmd-let for restoring spweb (Import-SPWeb -Identity http://spdev/forums/ -Path D:\Backups\forums.bak) I've got an error:

Import-SPWeb : Could not find file 'C:\Users\spadmin\AppData\Local\Temp\3\b386a19c-48bd-4a3a-b019-129ca9be4c5e\ExportSettings.xml'.

The reason of the error was in my inattention. The exported spweb was separated to 3 parts, but I have copied only the first one and forgot to copy others. When I copied missed files of export, import was ok.