fix: file type associations and cleanup script paths

[albersonmiranda]

Minor fixes in file associations and cleanup files path.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.43%. Comparing base (6a2ffdd) to head (7ef7380).
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Additional details and impacted files

Files with missing lines	Coverage Δ
R/use_extendr.R	98.76% <100.00%> (ø)

... and 2 files with indirect coverage changes

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