Secure GUI Programs

[Nobody III]

I've been thinking about writing graphical utilities (e.g. a file manager),
but I'm not sure whether I should be using Qt. Can I consider Qt secure for
things such as rendering filenames from untrusted filesystem servers? If
not, what do you suggest?

Also, is there a file manager anyone has already started making?

Another question: for previews/thumbnails (e.g. for icons), is it
reasonably efficient to render the preview for each file in its own
process, or should I batch them together?
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