(Updated 2011 August, 1st)
Under your /config folder as a sibling directory to your scripts folder there is a folder called /config/configuration.
Locate the <TeXworks>/config/configuration folder on your system and edit texworks-config.txt to include this kind of list,
note the addition of "Script documents (*.qs *.js *.py *.lua)" just before All files (*.* *)
If your texworks-config.txt already has some of these, they will all need to be made active (remove the leading #). If you remove one # all have to be removed for the filter list. Or else only the fileter with their # removed will show in your Open dialogue box.
The #file-open-filter: Dont want these (*.xxx) example below illustrates how to remove one from the list.
Left un-altered (all with # in front of them), an application standard default list shows in the File Open dialogue box.
# To override the built-in list of file types in the File/Open dialog,
# uncomment and customize these entries:
file-open-filter: TeX documents (*.tex)
file-open-filter: LaTeX documents (*.ltx)
file-open-filter: BibTeX databases (*.bib)
file-open-filter: Style Class etc files (*.sty *.cls *.dtx)
#file-open-filter: Class files (*.cls)
#file-open-filter: Documented macros (*.dtx)
file-open-filter: Auxiliary files (*.aux *.toc *.lot *.lof *.nav *.out *.snm *.ind *.idx *.bbl *.log)
file-open-filter: Text files (*.txt)
file-open-filter: HTML files (*.html *.htm *.xml *.ui)
file-open-filter: PDF documents (*.pdf)
#file-open-filter: Dont want these (*.xxx)
file-open-filter: Script documents (*.js *.qs *.py *.lua *.mod *.php *.bat *.txt *.csv *.log)
file-open-filter: Graphics (*.jpg *.png *.pdf)
file-open-filter: All files (*.* *)
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