If the file is a Embedded VM .c11 file then the name of the AutoAttendant and the language is stored in the file, the file name is of no importance because the embedded VM scans all files for the name within the file and then assosiate it to the correct user/group/AA.
In a hex editor it looks like this:
00000000h: 00 00 3B 0B 82 09 6E 6C 64 3A 41 41 5F 32 30 FF ; ..;.‚.nld:AA_20ÿ
00000010h: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ; ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000020h: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ; ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
00000030h: FF FF FF FF FF FF FF FF FF FF FF FE FE FD FD FC ; ÿÿÿÿÿÿÿÿÿÿÿþþýýü
The first eight bytes corresponds to the file length in HEX,the next byte is always 82 and the next byte gives the length of the filename, i.e. 20_AA.c11 = 9dec = 09hex, then comes the filename without .c11, nld:20_AA is the name of the AA.
All recorded messages are stored in the language directory depending on the locale setting of the IPO.
Knowing this it must be possible to change a .wav file to a c.11 file using the build in file converter. I've done that a few times.