UDL format is for classes only, and this format how that classes looks in Studio.
Export web files, available as any others in XML format with $system.OBJ.Export()
Exporting to XML started on 08/24/2016 20:52:44
Exporting CSP/CSR or file: /csp/user/ML_Util.js
Exporting CSP/CSR or file: /csp/user/menu.csp
Exporting CSP/CSR or file: /csp/user/showsource.csp
Export finished successfully.
And all web files stores as files in the directory for this web-application, so you can get it directly, but native export/import works only in XML