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    I am running 8.1 PRO on TOSHIBA SATELLITE C-55 and when I occasionally open Windows Explorer I encounter the following dialog box:

    1.0.7.16.2015/06/01 18:41:51 (possible date/time stamp?)

    CreateExpBtn, err:A call to an OS function failed.

    DISCLAIMER:

    This is a test platform which I evaluated WIN 10 as a TECH INSIDER on,  reinstalled WIN 8.1 PRO and this is the error which is generated; attempted to look up code with no success.

    Friday, August 12, 2016 8:27 PM

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    Hi,

    This article may help you.

    A call to an OS function failed error:

    https://winscp.net/forum/viewtopic.php?t=7486

    Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.

    Also I found several users who had the similar issue as yours, they gave the advice may help you, please refer to the link:

    call to OS function failed:

    http://answers.microsoft.com/en-us/windows/forum/windows_other-update/call-to-os-function-failed/163ab6b3-d57f-4291-8bbf-1f750ee014e7

    If the problem sill persists, I’m afraid there is something wrong with your TOSHIBA computer, you may need to connect manufacturer for further help.

    Best Regards,

    Tao

    Please remember to mark the replies as an answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Monday, August 15, 2016 9:41 AM
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    Hi,

    We haven't heard from you in a couple of days, have you solved the problem? We are looking forward to your good news.

    Best Regards,

    Tao

    Please remember to mark the replies as an answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Friday, August 19, 2016 8:37 AM