ENH: Support alternative (U)F names for embedded file retrieval #5930

Job	Run time
Build & verify package	12s
pytest on windows	7m 5s
Check code style issues	45s
pytest on 3.8 (crypto-lib: cryptography)	5m 45s
pytest on 3.9 (crypto-lib: cryptography)	6m 0s
pytest on 3.10 (crypto-lib: cryptography)	5m 43s
pytest on 3.11 (crypto-lib: cryptography)	5m 36s
pytest on 3.12 (crypto-lib: cryptography)	6m 50s
pytest on 3.13 (crypto-lib: cryptography)	6m 36s
pytest on 3.8 (crypto-lib: pycryptodome)	6m 3s
pytest on 3.8 (crypto-lib: none)	6m 3s
Combine & check coverage.	14s
	56m 52s

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