Bug: Export not providing file extension if filename contains a period

Export the morph search datasheet, the file is not saved as .xml if the filename contains a period. Normally the extension is provided automatically if it is not given. Word, Excel, etc., allow filenames that have periods in them and still provide their default extension.

Software version: 4.0b Beta 2.
Reported by PaulFelix, Rosie Perera.
Forum link: https://logos.vanillacommunities.com/forums/t/9143.aspx
Status: confirmed