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  • Ahem. This issue only arises on a single computer, the only computer I currently have running Windows and Office 2010.
    – Zev Spitz
    Commented Mar 13, 2019 at 11:02
  • Didn't you say something about other computers? In any case, my advice still applies.
    – harrymc
    Commented Mar 13, 2019 at 11:04
  • I see that Safe Mode Boot did not fix the problem, so it must be in relation to the way you install Office. Safe Mode only disables Windows-level products, so any plugins added to Office will still work and may cause problems.
    – harrymc
    Commented Mar 13, 2019 at 11:15
  • This is a clean install of Office; no addins. Also, I've added some details -- it seems that Word can't CreateFileMapping using the long paths, but it succeeds with the the DOS names.
    – Zev Spitz
    Commented Mar 13, 2019 at 11:20
  • Might the problem be simply the need for increased Maximum Path Length Limitation? In HKLM\SYSTEM\CurrentControlSet\Control\FileSystem REG_DWORD LongPathsEnabled.
    – harrymc
    Commented Mar 13, 2019 at 11:23