[Bug 589] New - ETCDIR environment var needed and other changes

http://bugs.codeweavers.com/show_bug.cgi?id=589

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+ +============================================================================+
+ | ETCDIR environment var needed and other changes                            |
+ +----------------------------------------------------------------------------+
+ |        Bug #: 589                         Product: Wine                    |
+ |       Status: UNCONFIRMED                 Version: unspecified             |
+ |   Resolution:                            Platform:                         |
+ |     Severity: normal                   OS/Version: All                     |
+ |     Priority: P1                        Component: wine-loader             |
+ +----------------------------------------------------------------------------+
+ |  Assigned To: wine-bugs(a)winehq.com                                         |
+ |  Reported By: wine_bugtracking_account(a)dias.com.br                         |
+ |      CC list: Cc:                                                          |
+ +----------------------------------------------------------------------------+
+ |    Milestone: TargetMilestone: ---                                         |
+ |          URL:                                                              |
+ +============================================================================+
+ |                              DESCRIPTION                                   |
+ right now wine has a WINEPREFIX env var to deal with the user config location.
+ however it does not a place to deal with a global configuration (read register).
+ 
+ Why this is important?
+ 
+ with this it will pbe possible to keep individual "fake-windows" trees 
+ with specialized programs installed.
+ 
+ With this one program will not interfere with anothers instalation.
+ 
+ However after installation each program will have its set of register created by
+ the installer and needed to be run.
+ 
+ Changing WINEPREFIX is not an option because changes made by the user will not
+ reflect into his personal reg files (~/.wine).
+ 
+ An alternative solution (maybe more interesting) would be to let wine use a
+ text dat file in the c:\windows\system.dat file instead of the binary windows
+ format.
+ 
+ with this, the loader would read the c:\windows\system.dat text file first,
+ then the global one (/etc/wine.systemreg) and update with the users setting 
+ in ~/.wine/*.reg .
+ 
+ Hey, it would be nice to be able to control the loading order from the 
+ command line and the C: path too.
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