I am trying to troubleshoot Microsoft OneDrive, in particular I'd like to know which files it has processed. I found this folder which contains a bunch of ODL files:


For instance, one filename is SyncEngine-2016-2-16.255.7212.11.odl

How do I open these ODL files? They appear to be in some binary format.

  • Well, from an online search, Microsoft uses .odl as an extension for Object Descriptor Langague files, as part of the COM+/OLE. msdn.microsoft.com/en-us/library/windows/desktop/… Here is the Format Definition: msdn.microsoft.com/en-us/library/windows/desktop/… ODL's are the glue that combines objects into a library. I can imagine ways that OLE might be involved in a MS synch product, but I have no idea if that is the case. – Frank Thomas Feb 16 '16 at 3:23
  • I am familiar with Object Descriptor Language files, but this is not one of them. I ended up with the same result as you when I did a Google search which is why I came here. The ODL files I am talking about here are in some binary format and have nothing to do with COM. – tom Feb 16 '16 at 12:21
  • @user1042151 any news? – El Mac Jun 1 '16 at 12:11
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    I'm suspicious that in this case ODL stands for "OneDrive Log". On a whim, I tried to open one in an SQLite database browser, and it recognized it as an encrypted SQLite database. No idea what the password is. Or that could be a total red herring. – Vimes Aug 31 '16 at 16:02
  • The logs have changed location in macOS Sierra - OneDrive v17.3.6517 Can open *.log but it looks like *.odl are encrypted SQL Lite files /Users/[username]/Library/Containers/com.microsoft.OneDrive-mac/Data/Library/Logs (And apologies in advance, but not enough credits to comment yet) – David Harris Oct 1 '16 at 12:14

Although ODL files are SQL databases, the OneDrive logs are exclusively for MS tracking and not to the general public. To enforce that rule, Microsoft encrypted it using a confidential key. Therefore, it is impossible to open them without knowing the correct key.

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    OPs question was about Microsoft OneDrive, not Edge. Your answer very may well be correct, but please edit it to accurately reflect an answer to OPs actual question. – music2myear Feb 20 '19 at 23:04
  • @music2myear Thanks for pointing that out, I've edited my answer – Anonymous Sep 24 '19 at 20:25

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