Windows 7: Is there such a file that should be on your OS as RUNDLL32.exe. MUI?

I've never heard of rundll32.exe. MUI. I have seen rundll32.exe. Trying to see if the .MUI file is a virus. thanks

there appears to be considerable information about this file--some says it's part of your system--some says it's 'possibly' malware.
it's been on my system since 30 days after I installed the OS in 2010 with no apparent problems.

see these links:
Fix rundll32.exe.mui Registry Errors - rundll32.exe.mui Error Database

Download rundll32.exe.mui - rundll32.exe.mui info - How to fix rundll32.exe.mui Errors

rundll32.exe.mui File Diagnosis Information - SpyDig

Rundll32.exe.mui - Microsoft Answers

be cautious of the links that offer 'free scans' as some may actually be malware--or just trying to sell you something.

Have you tried right-clicking the file and scanning it with your AV?

I don't have such a file either in my Ultimate or Home Premium version of Windows 7.

"MUI" extension is for Language Specific Resource File(s);

"A language-specific resource file normally contains user interface strings and other elements that require localization for a particular language. Your MUI application uses one language-specific resource file per supported language. The LN file for the application is the same for each language-specific resource file."

Nothing to be concerned about unless you are experiencing some problems and suspect an infection. Use a respected AV program to run a scan if you have doubts about the files integrity.

HTH