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This has nothing to do with portable. The behavior you describe is the way calibre is supposed to work. If the user specified regex does not match the file name, or results in the entire filename becoming the title, a default regex that matches the format for filenames calibre uses in its library is tried.
This behavior was broken for a while because of a bug, that bug was fixed in recent versions.
If you want to put the entire filename in tot he title field, you can use the search and replace tab of the bulk metadata edit dialog to do it after importing.
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