Opening a disk file places a lock on it. How can I disable this?

Question

Opening a local, disk-resident HTML file in Firefox seems to also place a lock on the ''directory'' in which it is.
If I try to delete the file, fine, the system does not object! If however I try to also delete the directory, even if I closed and ''deleted '' the file itself, I get an "Access denied.." response. Closing Firefox seem to remove the lock since then I have no problem deleting the directory.
I should mention that deleting, both of files and of the directory, is done (attempted) by a either a Perl script or from the Windows Explorer. Same result!
Is it possible to disable this locking, and if so, how do I do it?
Regards,

Answer 1

A couple of other possibilities:
The CD is dirty / damaged / suffering from "CD Rot" - sometimes CDs may seem to play fine on a CD player (or using the CD-player function of a PC) but will not transfer correctly to a computer - this is the result of the way that CD players auto-correct the datastream from the CD where PCs, when reading the audio CD as data, do not.
Enabling the error correction function in iTunes import may alleviate if not fully resolve this
Use an alternate tool to extract the audio from the CD - Exact Audio Copy is probably the best out there, as it can be configured to attempt multiple reads of every audio sample on a CD to get a consistent result.  Then import the resulting files into iTunes.
You don't say whether this is specific to one CD as in the original poster's case, but the "crackling" symptom has affected a significant number of users of the 64-bit version of iTunes 12.1.0.71 - these are mostly addressed in the most recent update (12.1.1.4), but if nothing else works it may be worth trying this alternative installer: iTunes 12.1.1 for Windows (64-bit — for older video cards)