[Bug 51706] New: Msi HANDLE_CustomType1 fails to load dll [patch]

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51706

Bug ID: 51706
           Summary: Msi HANDLE_CustomType1 fails to load dll [patch]
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msi
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 70581
  --> https://bugs.winehq.org/attachment.cgi?id=70581
Patch for correctly determine the bitness for CustomAction dll

do_msidbCustomActionTypeDll incorrectly assume dlls have the same "bitness" as
the calling application. The Windows GetBinaryTypeW function used actually
always fails for dll-types. From the documentation:

"If the file is a DLL, the last error code is ERROR_BAD_EXE_FORMAT."

If GetBinaryTypeW fails the fall back is incorrectly using the same bitness as
the application it self.

As far as I know there is no windows api to determine the bitness of DLLs. In
my attached patch I have written a new function to determine the DLL type.