env var is not taken into account in Project command

[jmlucjav]

I am on windows.

I can use an env var in the call here:
call project#rc("$USERPROFILE/Dropbox/solrlan")

But when defining projects,
Project 'proj1'
Project '$USERPROFILE/projects/p2'
p2 does not appear in the startup menu, apparently it is not taken into account.

[mateusduboli]

I think you should use the vim syntax for that, try

Project expand('$USERPROFILE') . '/projects/p2'