Yes, but the reverse is not true, and it would be a really bad idea to assume that all .dat files are parts. Even in the library, lots of the files are non-parts, because they are primitives or sub-parts. So while it might be acceptable to decide that a file is not a part because it doesn't have a .dat extension, you can't learn anything at all about a file with a .dat extension.
Modernizing The Spec [Poll]
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