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WPA fails to load symbols on a two level symbol store

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For some reason, when WPA download symbols, it queries.

/wssymbols//E//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//Extension.Appearance.Shared.pdb

when the right thing to query for would have been (note /E/ vs /Ex/)

/wssymbols//Ex//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//Extension.Appearance.Shared.pdb

The symbols are stored on a two-level symbol store with an index2 at the root, and is working fine from WinDbg and Visual Studio.

What is causing this?

Regards,

Staffan

SYMSRV:  BYINDEX: 0x398
         C:\symbols*http://symproxy/wssymbols
         \Extension.Appearance.Shared.pdb
         8212182830174D258A64DFF56DD3D519b
SYMSRV:  C:\symbols\\Extension.Appearance.Shared.pdb\8212182830174D258A64DFF56DD3D519b\\Extension.Appearance.Shared.pdb - file not found
SYMSRV:  HTTPGET: /wssymbols//E//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//Extension.Appearance.Shared.pdb
SYMSRV:  HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND
SYMSRV:  HTTPGET: /wssymbols//E//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//Extension.Appearance.Shared.pd_
SYMSRV:  HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND
SYMSRV:  HTTPGET: /wssymbols//E//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//file.ptr
SYMSRV:  HttpQueryInfo: 404 - HTTP_STATUS_NOT_FOUND
SYMSRV:  C:\symbols\\Extension.Appearance.Shared.pdb\8212182830174D258A64DFF56DD3D519b\\Extension.Appearance.Shared.pdb not found
SYMSRV:  http://symproxy/wssymbols//E//Extension.Appearance.Shared.pdb/8212182830174D258A64DFF56DD3D519b//Extension.Appearance.Shared.pdb not found


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