I added a fix to Win32 for Inkscape to load its resource files relative to the executable, from wherever Inkscape.exe is called. This is essential for calling Inkscape from other than the current directory, or double-clicking an icon.
This is especially useful for associating ".svg" with Inkscape. If, for example, you used this Registry file (with the path name corrected for your box), you could double-click a .svg file and have Inkscape open it. Save it as inkscape.reg, and double-click it to add to the registry.
The latest automated Win32 build has this enabled. I guess that in the future this Registry entry should be done by an installer.
======= SNIP ======= REGEDIT4
[HKEY_CLASSES_ROOT.svg] @="svgfile"
[HKEY_CLASSES_ROOT\svgfile] @="Scalable Vector Graphics File"
[HKEY_CLASSES_ROOT\svgfile\shell]
[HKEY_CLASSES_ROOT\svgfile\shell\edit] @=""
[HKEY_CLASSES_ROOT\svgfile\shell\edit\command] @="C:\inkscape\inkscape.exe "%1""