Default "open with"

Seems that whenever I happen to get a file without a resource fork that's also (A) either missing a file suffix, or (B) happens to have a file suffix the computer hasn't seen before, the system always assumes it's an mpeg file and wants to use QuickTime to open it.
I am just curious as to why the os has decided that QuickTime is the default app in those situations and if there is a way to set a default app for unknown files, some app other than QuickTime.
I know you can apply "use <some app> to always open files like these". I'm talking about files that the computer has never encountered before.
Thanks

See if RCDefaultApp 2.0.1 (freeware) helps.
<http://www.macupdate.com/info.php/id/14618>
Tom

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