'Show differences' gives bogus "Cannot open file"

[Philip]

My ViceVersa 2.5 is suddenly no longer able to show differences.
For any pair of files for which I have 'Full Control' in Properties->Security, I can 'Open' and view either file. But if I 'Show differences', WinMerge opens to compare the files, then WinMerge creates a pop-up with a red X saying e.g.

Cannot open file
\\?e:\Phil\code\bio\genomeScan.py

The operation completed successfully

BUT this is not the fault of WinMerge!
I can run WinMerge on the 2 files manually, and it shows the differences.

I have not changed any settings of ViceVersa since well before this started happening.

I'm using Windows 7 Pro.

[Philip]

It turns out it happens because I'm using the special "allow long filenames" format:

\\?\E:\code\bio\med\

instead of

E:\code\bio\med\

But I've used nothing but that method of specifying directories for about a year now, and don't recall seeing this behavior before. I have ViceVersa PRO 2.5 build 2518 64-bit. Can anyone verify that they can't show differences with an external diff program when using the \\?\ prefix, and that that's normal behavior for VV Pro 2.5?

[TGRMN Software]

Hi, if you use \\?\, ViceVersa will pass \\?\ too to the file compare program.
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TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com

[Philip]