gvpr on Windows does not support absolute paths
## Steps to reproduce Unzip e.g. https://www2.graphviz.org/Packages/stable/windows/10/msbuild/Release/Win32/graphviz-2.44.1-win32.zip and run gvpr with an absolute path: Run: 1. `echo BEGIN{} > test.gvpr` 2. `Graphviz\bin\gvpr.exe -f C:"\Users\magja\Downloads\graphviz-2.44.1-msbuild-win32-release"\test.gvpr` (or whatever) ## Expected Behaviour No error. ## Actual Behaviour ``` Graphviz\bin\gvpr.exe: Could not find file "C:\Users\magja\Downloads\graphviz-2.44.1-msbuild-win32-release\test.gvpr" in GVPRPATH Usage: Graphviz\bin\gvpr.exe [-o <ofile>] [-a <args>] ([-f <prog>] | 'prog') [files] -c - use source graph for output -f <pfile> - find program in file <pfile> -i - create node induced subgraph -a <args> - string arguments available as ARGV[0..] -o <ofile> - write output to <ofile>; stdout by default -n - no read-ahead of input graphs -q - turn off warning messages -V - print version info -? - print usage info If no files are specified, stdin is used The file does exist: ``` C:\Users\magja\Downloads\graphviz-2.44.1-msbuild-win32-release>more C:"\Users\magja\Downloads\graphviz-2.44.1-msbuild-win32-release"\test.gvpr BEGIN{} ``` ## OS Version Windows 10 ## Graphviz Version gvpr version 2.44.1 (20200629.0800) ## Additional info Relative paths work: ``` C:\Users\magja\Downloads\graphviz-2.44.1-msbuild-win32-release>Graphviz\bin\gvpr.exe -f test.gvpr ``` produces no error.
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