[TxMt] project won't handle unknown file

wondering if this is a bug or intended somehow ...

I opened a file, params.ini, to edit in TextMate. TextMate handled it fine besides no sytax highlighting since none has been defined presumably. But when I added it to a project with other PHP files, the file would not open in TextMate. For example, I clicked on it once from the project drawer and nothing would happen. if I double-clicked on it the file opened in SubEthaEdit (which I think was a decision made by the Finder). Shouldn't undefined text files still open in TextMate from the project drawer? Do I need to create a syntax plist as a workaround in the meantime? TextMate 1.01.

thanks, kumar