Your backup is from a different version of Windows SharePoint Services and cannot be restored to a server running the current version. The backup file should be restored to a server with version '12.0.0.6535' or later.

I tried to backup and restore a site collection from our production server to development. Our production is MOSS 2007 64 bit and Development is MOSS 2007 32 bit.

I got the following error when tried to restore the backed up file

"Your backup is from a different version of Windows SharePoint Services and cannot be restored to a server running the current version. The backup file should be  restored to a server with version '12.0.0.6535' or later."

When I checked the version of each SharePoint site Site Actions > Site Settings, both had different versions. In order to have a successful restoration, we need to sync both the SharePoint versions.

We were having version 12.0.0.6535 in production and 12.0.0.6421 in development.

I have fixed the issue by installing KB983444 which brought the MOSS 2007 to version 12.0.0.6535.
Run the Config wizard after  patch/hotfix/kb applied.

I'm able to use stsadm to restore from my backup into the new MOSS 2007 site.

Reference:
http://technet.microsoft.com/en-us/security/bulletin/MS10-039

http://www.microsoft.com/downloads/details.aspx?familyid=3841ceda-d0af-4e5e-8a1a-7dd954850783