Since you already have the filename, you can use that to get the pathname, rather than use some long formula again.
If your dump data (full file & path name) is in column B (from B2 downward), use the following formulas:
C2 (path):
D2 (filename, your current formula):
E2 (extension):
For the extension (E2), the formula I provided will handle up to 4-character extensions. If all files had 3-digit extensions you could simply use
=RIGHT(B2,4)
(which will also return the "." before the extension as you requested).
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