build 682 FreeCommander x64, UNC path, MD5, drag-drop errors

[jbosma]

When I do this:
- select a .EXE file with a UNC path (i.e. the path looks like \\server\dir1\dir2\file.exe)

and then do any of these operations:
- generate MD5 checksum via keyboard shortcut (F8 in my case, I am not sure whether that is a standard shortcut or one that I have customized)
- attempt to drag the file to the other FreeCommander window or to the desktop
- execute the .EXE by double-clicking, or by pressing <Enter>

Then what happens is that an error window is displayed:
"The archive file is corrupted: \\server\dir1\dir2\file.exe"

In the case of generating MD5, the MD5 result window exists and has the desired results, but it gets hidden behind the FreeCommander main window.

In the case of attempted drag-drop, nothing happens.

In the case of execute by double-click or <Enter>, the program loads and runs.

Copying the file to the other FC window using a keyboard shortcut works OK.
Copying the file to the other window or to the desktop using context menu copy / paste works OK.
Generating MD5 using menu operations File->Create MD5-checksums works OK.
Right-click and choose "Open" from the context menu (the default choice) and the program loads and runs OK.

If the directory is mapped to a drive letter then all operations work OK.

If the directory is accessed using the UNC path but the target file is not a .exe then all operations work OK. (not executing, obviously, but the context menu default operation runs successfully upon double-click or <Enter>.)

OS is Windows 7 Pro SP1.

[jbosma]

An additional observation: the problem is affected by Settings: Archiver plugins -> <tab> ZIP packer: fcZip -> Corrupted archive: show message and try to open.

When this setting is checked, the bug occurs (and is also reproducible on build 682 - 32 bit).

When the setting is not checked, the bug does not occur.

Just to verify, I do NOT have .exe listed as an extension for archiver plugins.