Hello, I encountered this issue only on windows why trying to use the ExternalData module with a file called: "slice_01524_z-5.0034um.tif"
I am tested with CMake 3.0.2 and 2.8.12.2 on widows for this test. Here is the test script: foreach(i RANGE ${CMAKE_ARGC}) message(STATUS "ARGV${i}: ${CMAKE_ARGV${i}}") endforeach() message(STATUS "ExternalData file: ${file}") Some runs: $ cmake -Dfile=good.tif -P EqualTest.cmake -- ARGV0: c:\Program Files (x86)\CMake 2.8\bin\cmake.exe -- ARGV1: -Dfile=good.tif -- ARGV2: -P -- ARGV3: EqualTest.cmake -- ARGV4: -- ExternalData file: good.tif [OK] $ cmake -Dfile=slice_01524_z=5.0034um.tif -P EqualTest.cmake -- ARGV0: c:\Program Files (x86)\CMake 2.8\bin\cmake.exe -- ARGV1: -Dfile=slice_01524_z=5.0034um.tif -- ARGV2: -P -- ARGV3: EqualTest.cmake -- ARGV4: -- ExternalData file: slice_01524_z=5.0034um.tif [OK] $ cmake -Dfile=InLens/slice_01524_z=5.0034um.tif -P EqualTest.cmake -- ARGV0: c:\Program Files (x86)\CMake 2.8\bin\cmake.exe -- ARGV1: -Dfile=InLens/slice_01524_z=5.0034um.tif -- ARGV2: -P -- ARGV3: EqualTest.cmake -- ARGV4: -- ExternalData file: InLens/slice_01524_z=5.0034um.tif [OK] $ cmake -Dfile=C:/slice_01524_z=5.0034um.tif -P EqualTest.cmake -- ARGV0: c:\Program Files (x86)\CMake 2.8\bin\cmake.exe -- ARGV1: -Dfile=C:/slice_01524_z=5.0034um.tif -- ARGV2: -P -- ARGV3: EqualTest.cmake -- ARGV4: -- ExternalData file: [FAIL] So it looks like when the value has the dive and an equal sign no value is assigned. Bug? Thanks, Brad -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake