[Bug 43805] New: Regedit.exe crashes when exporting certain registry keys e.g. " HKLM\Software\Classes\steam"

https://bugs.winehq.org/show_bug.cgi?id=43805

Bug ID: 43805
           Summary: Regedit.exe crashes when exporting certain registry
                    keys e.g. "HKLM\Software\Classes\steam"
           Product: Wine
           Version: 2.13
          Hardware: x86
               URL: https://steamcdn-a.akamaihd.net/client/installer/Steam
                    Setup.exe
                OS: Linux
            Status: NEW
          Keywords: download, regression
          Severity: normal
          Priority: P2
         Component: programs
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 37b5607ff6fbb8818f439a10b9370805e16b8fb1
      Distribution: ---

Created attachment 59341
  --> https://bugs.winehq.org/attachment.cgi?id=59341
regedit crash log

To reproduce the crash:
1. Install the Steam client but don't launch it (you don't need to have a Steam
account to reproduce the bug).
2. When installation is finished run 'wine regedit' and try to export either
'HKCU/Software/Classes/steam' or HKLM/Software/Classes/steam' and see
regedit.exe crashing.

The crash was introduced by

commit 37b5607ff6fbb8818f439a10b9370805e16b8fb1
Author: Hugh McMaster 
Date:   Wed Jul 19 05:29:05 2017 +0000

regedit: Export REG_SZ data via the export_data() function.

Arch Linux (64-bit)
Wine 2.18 (32-bit and 64-bit)