When starting Turbo C++ Explorer, you may get an error message stating:
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acces violation at adress 51F515BE rtl100.bpl....
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error with coreide100.bpl
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designeide100.bpl
The workaround is running "regasm" from .NET v1.1 to register the missing .NET assemblies used by Turbo C++ Explorer IDE. Go to the C:\Program Files\Borland\BDS\4.0\Bin directory and run
regasm Borland.Studio.Toolsets.dll
Now you should start the IDE successfully. If you still see an error message box, saying that a ClassId is missing or similar errors, you can solve this by registering all possible assemblies manually.
To do this, navigate to the BDS \Bin directory in the command line and type "dir Borland.Studio.*.tlb" to list all relevant .tlb files. Then, run "regasm" on the corresponding .dll file for each.(see http://support.borland.com/entry.jspa?externalID=4102&categoryID=39)
OK, then you start a new project from the menu File->New..., if you are unlucky to get an exception Class not registered, ClassID {17CD2E5A-9D11-4BB4-8030-1092F6645714}, here is a way to fix it:
Save the fix_turbo_cpp.reg file into your hard disk, and double click it to import itself into the Registry.(thanks Tim Lichtenberg, see http://qc.borland.com/wc/qcmain.aspx?d=25744)