The purpose of an archive is to guarantee permanence of library parts by encapsulating them with the project file.
In future, opening the archive also opens a special library with object elements contained in an independent library folder.
Solution:
You will share your file by saving it as an 8.0 project and sending it to your stooges.
You will save your 8.1 file as an 8.1 archive and re-open it, sending the tidy library it makes to your colleagues separately. Instruct them to specify this library when opening the file.
Dwight Atkinson