SyncToy 1.4 and Vista x64 Error (Fixed)

If you are receiving the following error when trying to run SyncToy 1.4 on Vista x64:

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: synctoy.exe
Problem Signature 02:
Problem Signature 03: 453f990b
Problem Signature 04: SqmManagedWrapper
Problem Signature 05:
Problem Signature 06: 453f9909
Problem Signature 07: 8
Problem Signature 08: 38
Problem Signature 09: System.BadImageFormatException
OS Version: 6.0.6000.
Locale ID: 3081

Then here is a fix:

  1. Install Microsoft Net Monitor 3.0.
  2. Copy the custsat.dll file from C:\Program Files\Microsoft Network Monitor 3.0\ (or wherever your Net Monitor installation is located).
  3. Paste the file into C:\Users\YourLoginName\AppData\Local\SyncToy\ (or wherever your SyncToy installation is located).

That’s it! Happy Syncing.


46 comments so far

  1. Brian A. on


    You saved me alot of time trying to figure this out myself. Keep posting!!

    Brian A.

  2. joshmouch on

    Thanks for the positive feedback. ๐Ÿ™‚ I was hoping I could help a few people out with this.

  3. Gruff Goat on

    Fantastic. Appreciate the posted info. Works for Win XP (x64) also.

  4. Will on

    Frickin brilliant!

  5. Zeke on

    Yes, now it works under Vista Ultimate x64!!

    Thanks a lot for your help!

  6. surfgrommet on

    also tested on Vista Ultimate x64…

    well done.. I won’t ask how you worked it out

    thank you

  7. Zeqe on

    On Vista Enterprise x64 the trick did it, it really saved my day!


  8. deltanova on

    Thankyou! (It wasn’t just me after all.)

  9. mark on

    It works perfect with vista x64 now. If only microsoft would fix this, thanks for the help!

  10. Ben on

    Nice fix – as others have noted, This fixes it on Vista Ultimate x64

  11. David - Hawaii on

    You da man!

  12. WildHeart on

    Hard to express my gratitude in words…

  13. Georg Wickenhauser on


    Thank you very much!!!


  14. M&M on

    Thank you very much for this fix.

    I have been a synctoy user for a while now and since I have gotten a 64-bit workstation, I have been unable to use this tool.


  15. Carlo on

    Works like a charm, thanks a lot!!! ๐Ÿ™‚

  16. […] it, too ); anyway before even opening WinDbg, a research on the Internet brought me to this blog: I tried, and it works like a charm! Wonderful, thanks a lot […]

  17. […] it, too ); anyway before even opening WinDbg, a research on the Internet brought me to this blog: I tried, and it works like a charm! Wonderful, thanks a lot […]

  18. Eric on

    Thanks, sync toy now works in Vista x64, when I replaced the cutsat.dll file.
    Excellent program, I can’t believe that Microsoft did such a poor job testing it in x64.

  19. Stevo on

    Thank you for showing the world how to correct yet another of Microsoft’s mistakes.

  20. Jeff_H on

    Happily reporting that the NetMon 3.1 custsat.dll fixes the issue on XP SP2 X64 as well.

    I used the X64 version of NetMon, available at:

    As an FYI – Default location of the file being replaced is:

    C:\Documents and Settings\\Local Settings\Application Data\SyncToy

  21. SpecialK on

    Tested and working on Server 2003 x64 as well.

    Thanks man.

  22. TSells on

    Great – Using it with Win XP Pro and now with Vista Ultimate. Great tool and a great fix.

  23. Idetrorce on

    very interesting, but I don’t agree with you

  24. jdharms on

    Works if you want to sync with a local drive, but it still crashes when you try to sync to a network location. Never had this problem when I ran 32bit Vista.

  25. JuMz on

    Nice tip. Worked on Windows Server 2003 x64.

  26. Chris on

    Lemme add to the positive feedback on this advice – it’s folks like you that keep me sane!

  27. Kleajmp on

    Thank you very much!

    One of the few good working applications M$ had,
    saved thanks to you!

  28. annearkee on

    Brilliant! Thanks, W2K3 Ent SP2 x64.

  29. Matthew Carter on


    I have Microsoft Windows XP SP2 x64 and it worked! Thank you.

  30. zed on


  31. skidu on

    ah great tip, thanks a lot ๐Ÿ™‚

  32. Marty on

    You’re a legend. Thank you very much.

  33. […] SyncToy from Microsoft does not work on x64 bit vista but there is a work around that I found here. […]

  34. Siva Folsom on


    Awesome!! Frigging Brilliant. Microsoft needs to hire you to fix their S?it.

  35. justin on

    thanks mate. worked great on server 2003 x64 as well! ๐Ÿ™‚

  36. Robert on

    Worked great thanks for the help!

  37. Gaz on

    Superb, saved me loads of time and hassle finding another solution. Great work.

  38. jerry on

    i cant even get synctoy to install on vista x64

  39. Michael on

    Thank man, wow that worked!!!

  40. Andy on

    Worked like a charm – thank you!

  41. chris on

    Dude ! Awesome! (used the 64 bit NetMon 3.1)

  42. CJ on

    Great tip. Thanks

  43. mozphat on

    OMG! Thanks a bunch. M$ should fix this annoying crash…

  44. Ragnenuaneido on

    I was exactly looking for something like that. I want make the best use of my blue shop Wanna good joke? How do they put out fires at the post office? They stamp them out.

  45. Enagree on

    In it called home owner insurance quote .car insurance comparison grayslake should not cheap car insurance pensacola memic auto insurance ,Realy nice car insurance cards
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  46. TheAutomotiveCraze on

    Very handy Tip man !!! Thanks to bring ease in my notebook’s life………..

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