filename cannot have underscore or dash

When typing filename for new project in QDS, the filename can only have alphanumeric characters.

Underscore and dash are widely used in filenames in the internet times.

Ideal situation:

Any string typed by the user can be used as filename.

Proposal:
When opening the creation, a popup should tell what are accepted characters (IF such restriction applies). 

Proposal 2:

the accepted filename could be shown with italics e.g. Filename