Version:            (using KDE KDE 3.3.91)
Installed from:    SuSE RPMs

To reproduce:

1. Compose a new message
2. Attach->Attach File
3. An "Attach file" dialog window pops up.  In the "Location:" field, specify a valid filename using a relative path and hit enter.  Examples:

./foo.txt
../bar.txt
foo/bar/baz.txt


Expected behaviour:

KMail should have attached the specified file.


Observed behaviour:

As you are typing the filename, autocompletion works as expected.  (That is, the rest of the filename appears in grey, indicating that the file selector does indeed recognize the presence of the file.)

Upon hitting enter, the file selector dialog closes and an error dialog pops up:

The file or folder ./foo.txt does not exist.

This is always reproducible.