I noticed that the name of an .SDLXLIFF file in a .WSXZ (WorldServer) package is longer than the extracted .SDLXLIFF file in the target language folder. So my question is:
Where is the file name of an .SDLXLIFF file stored inside a .WSXZ package?

I noticed that the name of an .SDLXLIFF file in a .WSXZ (WorldServer) package is longer than the extracted .SDLXLIFF file in the target language folder. So my question is:
Where is the file name of an .SDLXLIFF file stored inside a .WSXZ package?
If you want to view the actual SDLXLIFF file name, you can unpack the WSXZ package by renaming it to .zip
and extracting it using an archiving tool such as WinZip, 7-Zip, or similar.
However, the specific name of the SDLXLIFF file is generally not important. What matters is the metadata embedded within the bilingual file, which contains information about the WorldServer project it was exported from, the actual source file name etc. This metadata is what Trados Studio reads when opening the package, and what WorldServer checks when importing it back as a Return package.
The reason the SDLXLIFF file name in the target language folder is often shortened is to prevent the directory path from becoming too long—a common issue due to limitations in the Windows operating system. This shortening is done automatically to avoid path length errors.
I hope this answers your question!