[SOLVED] Difference between ACE.sln and ACE_wrappers.sln within ACE

Difference between ACE.sln and ACE_wrappers.sln within ACE_wrappers?

ACE = Adaptive Communication Environment
Download Source: http://download.dre.vanderbilt.edu/
When downloading ACE 6.4.0, there are the following VS solution files under 'ACE_WRAPPERS':

    ACE_vc12.sln
    ACE_vc14.sln
    ACE_wrappers_vc12.sln
    ALE_wrappers_vc14.sln

I get why there are separate vc12 and vc14 solutions, but why are there separate solutions for 'ACE' and 'ACE_wrappers'?
Could these solutions be combined? If so, are they separate for usability for unfamiliar developers? If not, why?
I use 'ACE.sln' to build ACE. When would I need 'ACE_wrappers.sln'? Examples are appreciated. I'm assuming ACE_wrapper.sln exists so that I can build upon it to meet/simplify needs of my software, making ACE and mySoftware compatible?

Solution

The ACE_wrappers_*.sln file contain all projects within ACE (including all examples and tests), the ACE_*.sln files only the ACE core library and the gperf utility. At the moment you use ACE and aren't interested in the examples/tests just use the ACE_*.sln ones.