PDF file is not generated properly if it has dots in the name

Creating pdf files without dots works fine. For example, if I want to create a file called `'somefile'`, I will get `somefile.pdf`. But if I try to create `'some.file'` I will get `some.file`, not pdf file. I guess, `saveAs` function interprets symbols after dot as a file extension. This happens only with pdf files, other types of files, such as excel files, work fine.