diff --git a/CMakeLists.txt b/CMakeLists.txt
index 723d235..f9b5cba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,24 +9,12 @@ list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
 # For OSX - don't clear RPATH on install
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 
-if (WIN32)
-    find_library (MMAN mman)
-    if(NOT(MMAN))
-    message(FATAL_ERROR "please install mman-win32")
-    else(NOT(MMAN))
-    set (extraLibs  ${extraLibs} ${MMAN})
-    endif(NOT(MMAN))
-ENDIF (WIN32)
-
 if (MSVC)
-    find_path(MMAN_INCLUDE_DIR sys/mman.h)
-
     #force std::complex<> typedefs in liquiddsp
     add_definitions(-D_LIBCPP_COMPLEX)
 
     #enable math definitions in math.h
     add_definitions(-D_USE_MATH_DEFINES)
-
 endif (MSVC)
 
 if (NOT CMAKE_CXX_FLAGS)
@@ -68,7 +56,6 @@ find_package(FFTW REQUIRED)
 find_package(Liquid REQUIRED)
 
 include_directories(
-    ${MMAN_INCLUDE_DIR}
     ${QT_INCLUDES}
     ${FFTW_INCLUDES}
     ${LIQUID_INCLUDES}
@@ -81,7 +68,6 @@ target_link_libraries(inspectrum
     ${QT_LIBRARIES}
     ${FFTW_LIBRARIES}
     ${LIQUID_LIBRARIES}
-    ${extraLibs}
 )
 set(INSTALL_DEFAULT_BINDIR "bin" CACHE STRING "Appended to CMAKE_INSTALL_PREFIX")
 
diff --git a/inputsource.cpp b/inputsource.cpp
index b5f2721..7568fc0 100644
--- a/inputsource.cpp
+++ b/inputsource.cpp
@@ -20,12 +20,9 @@
 
 #include "inputsource.h"
 
-#include <errno.h>
 #include <math.h>
 #include <stdio.h>
 #include <string.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
 
 #include <stdexcept>
 #include <algorithm>
@@ -107,13 +104,12 @@ InputSource::~InputSource()
 void InputSource::cleanup()
 {
     if (mmapData != nullptr) {
-        munmap(mmapData, fileSize);
+        inputFile->unmap(mmapData);
         mmapData = nullptr;
-        fileSize = 0;
     }
 
     if (inputFile != nullptr) {
-        fclose(inputFile);
+        delete inputFile;
         inputFile = nullptr;
     }
 }
@@ -138,28 +134,21 @@ void InputSource::openFile(const char *filename)
         sampleAdapter = std::unique_ptr<SampleAdapter>(new ComplexF32SampleAdapter());
     }
 
-    errno = 0;
-    FILE *file = fopen(filename, "rb");
-    if (file == nullptr) {
-        std::stringstream ss;
-        ss << "Error opening file: " << strerror(errno) << " (" << errno << ")";
-        throw std::runtime_error(ss.str());
+    std::unique_ptr<QFile> file(new QFile(filename));
+    if (!file->open(QFile::ReadOnly)) {
+        throw std::runtime_error(file->errorString().toStdString());
     }
 
-    struct stat sb;
-    if (fstat(fileno(file), &sb) != 0)
-        throw std::runtime_error("Error fstating file");
-    off_t size = sb.st_size;
+    auto size = file->size();
     sampleCount = size / sampleAdapter->sampleSize();
 
-    auto data = mmap(NULL, size, PROT_READ, MAP_SHARED, fileno(file), 0);
+    auto data = file->map(0, size);
     if (data == nullptr)
         throw std::runtime_error("Error mmapping file");
 
     cleanup();
 
-    inputFile = file;
-    fileSize = size;
+    inputFile = file.release();
     mmapData = data;
 
     invalidate();
diff --git a/inputsource.h b/inputsource.h
index ff7ea76..ac94dda 100644
--- a/inputsource.h
+++ b/inputsource.h
@@ -21,6 +21,7 @@
 #pragma once
 
 #include <complex>
+#include <QFile>
 #include "samplesource.h"
 
 class SampleAdapter {
@@ -32,11 +33,10 @@ public:
 class InputSource : public SampleSource<std::complex<float>>
 {
 private:
-    FILE *inputFile = nullptr;
-    off_t fileSize = 0;
+    QFile *inputFile = nullptr;
     off_t sampleCount = 0;
     off_t sampleRate = 0;
-    void *mmapData = nullptr;
+    uchar *mmapData = nullptr;
     std::unique_ptr<SampleAdapter> sampleAdapter;
 
 public: