I perused search.cpan.org, to see if any modules were available to open/manipulate SIT files. (Note, I googled this, and assume you're talking about Mac StuffIt files, compressed files native for the Mac.)
I found Archive::Tar, which produces files readable by the StuffIt Expander program, and I found Mac::AppleSingle, which can seemingly read files in AppleSingle/AppleDouble formats. Note that AppleSingle/AppleDouble are older formats. You may be able to make use of these, but most likely you'll have to make a system() call to uncompress the file first.
I encourage you to check the Mac forums. Good luck!
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