According to José Campos:
The point is to have TM consider files with a variable extension as
text, like the ones I have to deal with : the extension is a 8-digit number representing the date the document was edited (*.20041023 for instance)
Side note: this information does not belong to the filename namespace. It should be handled through other means such as a revision control system or the ctime/mtime/atime metadata stored in the inode...