Access to Regedit.exe or Reg.exe must not be disabled through Group Policy. FlexEngine uses Regedit.exe to add user-specific settings to the registry. Depending on the User Account Control (UAC) settings on Windows 7 or later, FlexEngine might use Reg.exe.

User Environment Manager might not work properly on some Windows versions if access to Regedit.exe is disabled through Group Policy, unless the option Disable regedit from running silently? is set to No. However, this setting is insufficient for Reg.exe. This means that if Regedit.exe cannot run due to UAC, this policy must remain unset.

If users are not allowed to run Regedit.exe silently, an error message might appear when they log in. An error message is also written to the FlexEngine log file.