diff --git a/bin/obj2gltf.js b/bin/obj2gltf.js
index 478664c..2c76c20 100644
--- a/bin/obj2gltf.js
+++ b/bin/obj2gltf.js
@@ -21,14 +21,23 @@ var argv = yargs
             alias: 'i',
             describe: 'Path to the obj file.',
             type: 'string',
-            normalize: true,
-            demandOption: true
+            coerce : function (p) {
+                if (p.length === 0) {
+                    throw new Error('Input path must be a file name');
+                }
+                return path.resolve(p);
+            }
         },
         output : {
             alias: 'o',
             describe: 'Path of the converted glTF file.',
             type: 'string',
-            normalize: true
+            coerce : function (p) {
+                if (p.length === 0) {
+                    throw new Error('Output path must be a file name');
+                }
+                return path.resolve(p);
+            }
         },
         binary : {
             alias: 'b',
diff --git a/lib/loadMtl.js b/lib/loadMtl.js
index 5b5c72b..8a7aa96 100644
--- a/lib/loadMtl.js
+++ b/lib/loadMtl.js
@@ -68,19 +68,19 @@ function loadMtl(mtlPath) {
             value = line.substring(3).trim();
             material.alpha = 1.0 - parseFloat(value);
         } else if (/^map_Ka /i.test(line)) {
-            material.ambientTexture = path.resolve(mtlDirectory, line.substring(7).trim());
+            material.ambientTexture = normalizeTexturePath(line.substring(7).trim(), mtlDirectory);
         } else if (/^map_Ke /i.test(line)) {
-            material.emissionTexture = path.resolve(mtlDirectory, line.substring(7).trim());
+            material.emissionTexture = normalizeTexturePath(line.substring(7).trim(), mtlDirectory);
         } else if (/^map_Kd /i.test(line)) {
-            material.diffuseTexture = path.resolve(mtlDirectory, line.substring(7).trim());
+            material.diffuseTexture = normalizeTexturePath(line.substring(7).trim(), mtlDirectory);
         } else if (/^map_Ks /i.test(line)) {
-            material.specularTexture = path.resolve(mtlDirectory, line.substring(7).trim());
+            material.specularTexture = normalizeTexturePath(line.substring(7).trim(), mtlDirectory);
         } else if (/^map_Ns /i.test(line)) {
-            material.specularShininessMap = path.resolve(mtlDirectory, line.substring(7).trim());
+            material.specularShininessMap = normalizeTexturePath(line.substring(7).trim(), mtlDirectory);
         } else if (/^map_Bump /i.test(line)) {
-            material.normalMap = path.resolve(mtlDirectory, line.substring(9).trim());
+            material.normalMap = normalizeTexturePath(line.substring(9).trim(), mtlDirectory);
         } else if (/^map_d /i.test(line)) {
-            material.alphaMap = path.resolve(mtlDirectory, line.substring(6).trim());
+            material.alphaMap = normalizeTexturePath(line.substring(6).trim(), mtlDirectory);
         }
     }
 
@@ -89,3 +89,14 @@ function loadMtl(mtlPath) {
             return materials;
         });
 }
+
+function normalizeTexturePath(texturePath, mtlDirectory) {
+    // Removes texture options from texture name
+    // Assumes no spaces in texture name
+    var re = /-(bm|t|s|o|blendu|blendv|boost|mm|texres|clamp|imfchan|type)/;
+    if (re.test(texturePath)) {
+        texturePath = texturePath.split(/\s+/).pop();
+    }
+    texturePath = texturePath.replace(/\\/g, '/');
+    return path.normalize(path.join(mtlDirectory, texturePath));
+}
diff --git a/lib/loadObj.js b/lib/loadObj.js
index eb5131b..efe97a9 100644
--- a/lib/loadObj.js
+++ b/lib/loadObj.js
@@ -537,6 +537,11 @@ function finishLoading(nodes, mtlPaths, objPath, options) {
         });
 }
 
+function normalizeMtlPath(mtlPath, objDirectory) {
+    mtlPath = mtlPath.replace(/\\/g, '/');
+    return path.normalize(path.join(objDirectory, mtlPath));
+}
+
 function outsideDirectory(filePath, objPath) {
     return (path.relative(path.dirname(objPath), filePath).indexOf('..') === 0);
 }
@@ -547,7 +552,7 @@ function loadMaterials(mtlPaths, objPath, options) {
     var objDirectory = path.dirname(objPath);
     var materials = {};
     return Promise.map(mtlPaths, function(mtlPath) {
-        mtlPath = path.resolve(objDirectory, mtlPath);
+        mtlPath = normalizeMtlPath(mtlPath, objDirectory);
         if (secure && outsideDirectory(mtlPath, objPath)) {
             logger('Could not read mtl file at ' + mtlPath + ' because it is outside of the obj directory and the secure flag is true. Using default material instead.');
             return;
diff --git a/specs/data/box-windows-paths/box-windows-paths.obj b/specs/data/box-windows-paths/box-windows-paths.obj
new file mode 100644
index 0000000..1c37d5b
--- /dev/null
+++ b/specs/data/box-windows-paths/box-windows-paths.obj
@@ -0,0 +1,46 @@
+# Blender v2.78 (sub 0) OBJ File: 'box.blend'
+# www.blender.org
+mtllib materials\\box-windows-paths.mtl
+o Cube
+v -1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 -1.000000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 0.0000 0.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 1.0000
+vt 1.0000 0.0000
+vt 1.0000 1.0000
+vt 0.0000 0.0000
+vt 0.0000 1.0000
+vn -1.0000 0.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn 1.0000 0.0000 0.0000
+vn 0.0000 0.0000 1.0000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 1.0000 0.0000
+usemtl Material
+s off
+f 1/1/1 2/2/1 4/3/1 3/4/1
+f 3/5/2 4/6/2 8/7/2 7/8/2
+f 7/9/3 8/10/3 6/11/3 5/12/3
+f 5/13/4 6/14/4 2/15/4 1/16/4
+f 3/5/5 7/17/5 5/18/5 1/16/5
+f 8/19/6 4/6/6 2/15/6 6/20/6
diff --git a/specs/data/box-windows-paths/materials/box-windows-paths.mtl b/specs/data/box-windows-paths/materials/box-windows-paths.mtl
new file mode 100644
index 0000000..22bca2d
--- /dev/null
+++ b/specs/data/box-windows-paths/materials/box-windows-paths.mtl
@@ -0,0 +1,13 @@
+# Blender MTL File: 'box.blend'
+# Material Count: 1
+
+newmtl Material
+Ns 96.078431
+Ka 0.000000 0.000000 0.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Kd .\images\cesium.png
diff --git a/specs/data/box-windows-paths/materials/images/cesium.png b/specs/data/box-windows-paths/materials/images/cesium.png
new file mode 100644
index 0000000..3b8baee
Binary files /dev/null and b/specs/data/box-windows-paths/materials/images/cesium.png differ
diff --git a/specs/lib/loadMtlSpec.js b/specs/lib/loadMtlSpec.js
index 976b322..9d13473 100644
--- a/specs/lib/loadMtlSpec.js
+++ b/specs/lib/loadMtlSpec.js
@@ -6,7 +6,7 @@ var complexMaterialUrl = 'specs/data/box-complex-material/box-complex-material.m
 var multipleMaterialsUrl = 'specs/data/box-multiple-materials/box-multiple-materials.mtl';
 
 function getImagePath(objPath, relativePath) {
-    return path.resolve(path.dirname(objPath), relativePath);
+    return path.normalize(path.join(path.dirname(objPath), relativePath));
 }
 
 describe('loadMtl', function() {
diff --git a/specs/lib/loadObjSpec.js b/specs/lib/loadObjSpec.js
index a43930d..bfe4c44 100644
--- a/specs/lib/loadObjSpec.js
+++ b/specs/lib/loadObjSpec.js
@@ -30,6 +30,7 @@ var objExternalResourcesUrl = 'specs/data/box-external-resources/box-external-re
 var objTexturedUrl = 'specs/data/box-textured/box-textured.obj';
 var objMissingTextureUrl = 'specs/data/box-missing-texture/box-missing-texture.obj';
 var objSubdirectoriesUrl = 'specs/data/box-subdirectories/box-textured.obj';
+var objWindowsPathsUrl = 'specs/data/box-windows-paths/box-windows-paths.obj';
 var objComplexMaterialUrl = 'specs/data/box-complex-material/box-complex-material.obj';
 var objInvalidContentsUrl = 'specs/data/box/box.mtl';
 var objInvalidUrl = 'invalid.obj';
@@ -59,7 +60,7 @@ function getPrimitives(data) {
 }
 
 function getImagePath(objPath, relativePath) {
-    return path.resolve(path.dirname(objPath), relativePath);
+    return path.normalize(path.join(path.dirname(objPath), relativePath));
 }
 
 var defaultOptions = obj2gltf.defaults;
@@ -346,6 +347,15 @@ describe('loadObj', function() {
             }), done).toResolve();
     });
 
+    it('loads obj with windows paths', function(done) {
+        expect(loadObj(objWindowsPathsUrl, defaultOptions)
+            .then(function(data) {
+                var imagePath = getImagePath(objWindowsPathsUrl, path.join('materials', 'images', 'cesium.png'));
+                expect(data.images[imagePath]).toBeDefined();
+                expect(data.materials.Material.diffuseTexture).toEqual(imagePath);
+            }), done).toResolve();
+    });
+
     it('loads obj with complex material', function(done) {
         expect(loadObj(objComplexMaterialUrl, defaultOptions)
             .then(function(data) {