diff --git a/BasiliskII/src/Windows/cd_defs.h b/BasiliskII/src/Windows/cd_defs.h
index 8aaa595b..f58069e5 100755
--- a/BasiliskII/src/Windows/cd_defs.h
+++ b/BasiliskII/src/Windows/cd_defs.h
@@ -23,6 +23,8 @@
 #define MAXIMUM_NUMBER_TRACKS 100
 #define MAXIMUM_CDROM_SIZE 804
 
+#pragma pack(push, 1)
+
 typedef struct _TRACK_DATA {
     UCHAR Reserved;
     UCHAR Control : 4;
@@ -30,14 +32,14 @@ typedef struct _TRACK_DATA {
     UCHAR TrackNumber;
     UCHAR Reserved1;
     UCHAR Address[4];
-} ATTRIBUTE_PACKED TRACK_DATA, *PTRACK_DATA;
+} TRACK_DATA, *PTRACK_DATA;
 
 typedef struct _CDROM_TOC {
     UCHAR Length[2];
     UCHAR FirstTrack;
     UCHAR LastTrack;
     TRACK_DATA TrackData[MAXIMUM_NUMBER_TRACKS];
-} ATTRIBUTE_PACKED CDROM_TOC, *PCDROM_TOC;
+} CDROM_TOC, *PCDROM_TOC;
 
 // #include "ntddcdrm.h"
 #define IOCTL_CDROM_BASE                 FILE_DEVICE_CD_ROM
@@ -61,7 +63,7 @@ typedef struct _CDROM_TOC {
 
 typedef struct _VOLUME_CONTROL {
     UCHAR PortVolume[4];
-} ATTRIBUTE_PACKED VOLUME_CONTROL, *PVOLUME_CONTROL;
+} VOLUME_CONTROL, *PVOLUME_CONTROL;
 
 typedef struct _CDROM_PLAY_AUDIO_MSF {
     UCHAR StartingM;
@@ -70,13 +72,13 @@ typedef struct _CDROM_PLAY_AUDIO_MSF {
     UCHAR EndingM;
     UCHAR EndingS;
     UCHAR EndingF;
-} ATTRIBUTE_PACKED CDROM_PLAY_AUDIO_MSF, *PCDROM_PLAY_AUDIO_MSF;
+} CDROM_PLAY_AUDIO_MSF, *PCDROM_PLAY_AUDIO_MSF;
 
 typedef struct _CDROM_SEEK_AUDIO_MSF {
     UCHAR M;
     UCHAR S;
     UCHAR F;
-} ATTRIBUTE_PACKED CDROM_SEEK_AUDIO_MSF, *PCDROM_SEEK_AUDIO_MSF;
+} CDROM_SEEK_AUDIO_MSF, *PCDROM_SEEK_AUDIO_MSF;
 
 
 //
@@ -87,7 +89,7 @@ typedef struct _SUB_Q_HEADER {
     UCHAR Reserved;
     UCHAR AudioStatus;
     UCHAR DataLength[2];
-} ATTRIBUTE_PACKED SUB_Q_HEADER, *PSUB_Q_HEADER;
+} SUB_Q_HEADER, *PSUB_Q_HEADER;
 
 typedef struct _SUB_Q_CURRENT_POSITION {
     SUB_Q_HEADER Header;
@@ -98,7 +100,7 @@ typedef struct _SUB_Q_CURRENT_POSITION {
     UCHAR IndexNumber;
     UCHAR AbsoluteAddress[4];
     UCHAR TrackRelativeAddress[4];
-} ATTRIBUTE_PACKED SUB_Q_CURRENT_POSITION, *PSUB_Q_CURRENT_POSITION;
+} SUB_Q_CURRENT_POSITION, *PSUB_Q_CURRENT_POSITION;
 
 typedef struct _SUB_Q_MEDIA_CATALOG_NUMBER {
     SUB_Q_HEADER Header;
@@ -107,7 +109,7 @@ typedef struct _SUB_Q_MEDIA_CATALOG_NUMBER {
     UCHAR Reserved1 : 7;
     UCHAR Mcval : 1;
     UCHAR MediaCatalog[15];
-} ATTRIBUTE_PACKED SUB_Q_MEDIA_CATALOG_NUMBER, *PSUB_Q_MEDIA_CATALOG_NUMBER;
+} SUB_Q_MEDIA_CATALOG_NUMBER, *PSUB_Q_MEDIA_CATALOG_NUMBER;
 
 typedef struct _SUB_Q_TRACK_ISRC {
     SUB_Q_HEADER Header;
@@ -118,7 +120,7 @@ typedef struct _SUB_Q_TRACK_ISRC {
     UCHAR Reserved2 : 7;
     UCHAR Tcval : 1;
     UCHAR TrackIsrc[15];
-} ATTRIBUTE_PACKED SUB_Q_TRACK_ISRC, *PSUB_Q_TRACK_ISRC;
+} SUB_Q_TRACK_ISRC, *PSUB_Q_TRACK_ISRC;
 
 typedef union _SUB_Q_CHANNEL_DATA {
     SUB_Q_CURRENT_POSITION CurrentPosition;
@@ -136,16 +138,16 @@ typedef struct __RAW_READ_INFO {
     LARGE_INTEGER DiskOffset;
     ULONG    SectorCount;
     TRACK_MODE_TYPE TrackMode;
-} ATTRIBUTE_PACKED RAW_READ_INFO, *PRAW_READ_INFO;
+} RAW_READ_INFO, *PRAW_READ_INFO;
 
 typedef struct _CDROM_SUB_Q_DATA_FORMAT {
     UCHAR Format;
     UCHAR Track;
-} ATTRIBUTE_PACKED CDROM_SUB_Q_DATA_FORMAT, *PCDROM_SUB_Q_DATA_FORMAT;
+} CDROM_SUB_Q_DATA_FORMAT, *PCDROM_SUB_Q_DATA_FORMAT;
 
 #define IOCTL_CDROM_SUB_Q_CHANNEL    0x00
 #define IOCTL_CDROM_CURRENT_POSITION 0x01
 #define IOCTL_CDROM_MEDIA_CATALOG    0x02
 #define IOCTL_CDROM_TRACK_ISRC       0x03
 
-#pragma pack()
+#pragma pack(pop)
diff --git a/BasiliskII/src/Windows/clip_windows.cpp b/BasiliskII/src/Windows/clip_windows.cpp
index 1e6f982b..c4ee65bc 100755
--- a/BasiliskII/src/Windows/clip_windows.cpp
+++ b/BasiliskII/src/Windows/clip_windows.cpp
@@ -21,8 +21,6 @@
 #include "sysdeps.h"
 
 #include <vector>
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
 
 #include "macos_util.h"
 #include "clip.h"
@@ -236,7 +234,7 @@ static void do_getscrap(void **handle, uint32 type, int32 offset)
 
 						// Convert text from ISO-Latin1 to Mac charset
 						uint8 *p = Mac2HostAddr(scrap_area);
-						for (int i = 0; i < length; i++) {
+						for (uint32 i = 0; i < length; i++) {
 							uint8 c = data[i];
 							if (c < 0x80) {
 								if (c == 0)
@@ -262,7 +260,7 @@ static void do_getscrap(void **handle, uint32 type, int32 offset)
 						0x2f, 0x3c, 0, 0, 0, 0,		// move.l	#outbuf,-(sp)
 						0xa9, 0xfe,					// PutScrap()
 						0x58, 0x8f,					// addq.l	#4,sp
-						M68K_RTS >> 8, M68K_RTS
+						uint8(M68K_RTS >> 8), uint8(M68K_RTS)
 					};
 					uint32 proc_area = Host2MacAddr(proc);
 					WriteMacInt32(proc_area +  6, out_length);
diff --git a/BasiliskII/src/Windows/prefs_windows.cpp b/BasiliskII/src/Windows/prefs_windows.cpp
index ef3eac10..c7789fbc 100755
--- a/BasiliskII/src/Windows/prefs_windows.cpp
+++ b/BasiliskII/src/Windows/prefs_windows.cpp
@@ -20,9 +20,6 @@
 
 #include "sysdeps.h"
 
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
 #include <stdio.h>
 #include <stdlib.h>
 
diff --git a/BasiliskII/src/Windows/router/router_types.h b/BasiliskII/src/Windows/router/router_types.h
index 1185dccb..9dcc8e63 100755
--- a/BasiliskII/src/Windows/router/router_types.h
+++ b/BasiliskII/src/Windows/router/router_types.h
@@ -23,7 +23,7 @@
 #ifndef _ROUTER_TYPES_H_
 #define _ROUTER_TYPES_H_
 
-#pragma pack(1)
+#pragma pack(push, 1)
 
 
 // --------------------------- MAC ---------------------------
@@ -31,7 +31,7 @@ typedef struct {
 	uint8 dest[6];
 	uint8 src[6];
 	uint16 type;
-} ATTRIBUTE_PACKED mac_t;
+} mac_t;
 
 enum {
 	mac_type_llc_ipx_limit	= 0x05DC, // <= mac_type_llc_ipx_limit -->> 802.3 MAC frame
@@ -54,7 +54,7 @@ typedef struct {
 	uint8 srcp[4];	// size for ip
 	uint8 dsth[6];	// size for ethernet
 	uint8 dstp[4];	// size for ip
-} ATTRIBUTE_PACKED arp_t;
+} arp_t;
 
 enum {
 	arp_request = 1,
@@ -79,7 +79,7 @@ typedef struct {
 	uint32 src;
 	uint32 dest;
 	// ip options, size = 4 * header_len - 20
-} ATTRIBUTE_PACKED ip_t;
+} ip_t;
 
 // Protocol STD numbers
 enum {
@@ -95,7 +95,7 @@ typedef struct {
 	uint8 code;
 	uint16 checksum;
 	// data
-} ATTRIBUTE_PACKED icmp_t;
+} icmp_t;
 
 enum {
 	icmp_Echo_reply	= 0,
@@ -140,7 +140,7 @@ typedef struct {
 	uint16 urgent_ptr;
 	// options + padding: size = dataoffset*4-20
 	// data
-} ATTRIBUTE_PACKED tcp_t;
+} tcp_t;
 
 enum {
 	tcp_flags_URG = 0x20,	// The urgent pointer field is significant in this segment.
@@ -173,15 +173,15 @@ typedef struct {
 	uint16 msg_len;
 	uint16 checksum;
 	// data
-} ATTRIBUTE_PACKED udp_t;
+} udp_t;
 
 typedef struct {
 	uint16 src_lo, src_hi;
 	uint16 dest_lo, dest_hi;
 	uint16 proto;
 	uint16 msg_len;
-} ATTRIBUTE_PACKED pseudo_ip_t;
+} pseudo_ip_t;
 
-#pragma pack()
+#pragma pack(pop)
 
 #endif // _ROUTER_TYPES_H_
diff --git a/BasiliskII/src/Windows/serial_windows.cpp b/BasiliskII/src/Windows/serial_windows.cpp
index 4f4639fe..4a1300b2 100755
--- a/BasiliskII/src/Windows/serial_windows.cpp
+++ b/BasiliskII/src/Windows/serial_windows.cpp
@@ -166,8 +166,8 @@ public:
 private:
 	bool configure(uint16 config);
 	void set_handshake(uint32 s, bool with_dtr);
-	static WINAPI unsigned int input_func(void *arg);
-	static WINAPI unsigned int output_func(void *arg);
+	static unsigned int WINAPI input_func(void *arg);
+	static unsigned int WINAPI output_func(void *arg);
 	static int acknowledge_error(HANDLE h, bool is_read);
 	bool set_timeouts(int bauds, int parity_bits, int stop_bits);
 
diff --git a/BasiliskII/src/Windows/sys_windows.cpp b/BasiliskII/src/Windows/sys_windows.cpp
index 4a50d658..9e3ed385 100755
--- a/BasiliskII/src/Windows/sys_windows.cpp
+++ b/BasiliskII/src/Windows/sys_windows.cpp
@@ -20,8 +20,6 @@
 
 #include "sysdeps.h"
 
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
 #include <winioctl.h>
 
 #include <string>
@@ -497,11 +495,11 @@ void *Sys_open(const char *path_name, bool read_only)
 		}
 	}
 
-	if (fh->is_floppy && first_floppy == NULL)
-		first_floppy = fh;
-
-	if (fh)
+	if (fh) {
+		if (fh->is_floppy && first_floppy == NULL)
+			first_floppy = fh;
 		sys_add_file_handle(fh);
+	}
 
 	return fh;
 }
@@ -793,7 +791,7 @@ bool SysCDReadTOC(void *arg, uint8 *toc)
 						   NULL, 0,
 						   toc, min((int)sizeof(CDROM_TOC), 804),
 						   &dummy,
-						   NULL);
+						   NULL) != FALSE;
 }
 
 
@@ -819,7 +817,7 @@ bool SysCDGetPosition(void *arg, uint8 *pos)
 							  &q_format, sizeof(CDROM_SUB_Q_DATA_FORMAT),
 							  &q_data, sizeof(SUB_Q_CHANNEL_DATA),
 							  &dwBytesReturned,
-							  NULL);
+							  NULL) != FALSE;
 	if (ok)
 		memcpy(pos, &q_data.CurrentPosition, sizeof(SUB_Q_CURRENT_POSITION));
 
@@ -851,7 +849,7 @@ bool SysCDPlay(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, uint8 end
 						   &msf, sizeof(CDROM_PLAY_AUDIO_MSF),
 						   NULL, 0,
 						   &dwBytesReturned,
-						   NULL);
+						   NULL) != FALSE;
 }
 
 
@@ -871,7 +869,7 @@ bool SysCDPause(void *arg)
 						   NULL, 0,
 						   NULL, 0,
 						   &dwBytesReturned,
-						   NULL);
+						   NULL) != FALSE;
 }
 
 
@@ -890,7 +888,7 @@ bool SysCDResume(void *arg)
 						   IOCTL_CDROM_RESUME_AUDIO,
 						   NULL, 0,
 						   NULL, 0,
-						   &dwBytesReturned, NULL);
+						   &dwBytesReturned, NULL) != FALSE;
 }
 
 
@@ -910,7 +908,7 @@ bool SysCDStop(void *arg, uint8 lead_out_m, uint8 lead_out_s, uint8 lead_out_f)
 						   NULL, 0,
 						   NULL, 0,
 						   &dwBytesReturned,
-						   NULL);
+						   NULL) != FALSE;
 }
 
 
@@ -935,7 +933,7 @@ bool SysCDScan(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, bool reve
 						   &msf, sizeof(CDROM_SEEK_AUDIO_MSF),
 						   NULL, 0,
 						   &dwBytesReturned,
-						   NULL);
+						   NULL) != FALSE;
 }
 
 
diff --git a/BasiliskII/src/Windows/sysdeps.h b/BasiliskII/src/Windows/sysdeps.h
index b64a19fa..8f6fa72b 100755
--- a/BasiliskII/src/Windows/sysdeps.h
+++ b/BasiliskII/src/Windows/sysdeps.h
@@ -21,7 +21,7 @@
 #ifndef SYSDEPS_H
 #define SYSDEPS_H
 
-#ifndef __STDC__
+#if !defined _MSC_VER && !defined __STDC__
 #error "Your compiler is not ANSI. Get a real one."
 #endif
 
@@ -41,9 +41,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#ifdef __WIN32__
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
-#endif
+#include <WinSock2.h>
 #include <sys/types.h>
 
 
@@ -78,6 +78,10 @@
 /* ExtFS is supported */
 #define SUPPORTS_EXTFS 1
 
+/* POSIX data types missing from Microsoft's CRT */
+#ifdef _MSC_VER
+typedef ptrdiff_t ssize_t;
+#endif
 
 /* Data types */
 typedef unsigned char uint8;
@@ -123,13 +127,21 @@ typedef int64 intptr;
 #error "Unsupported size of pointer"
 #endif
 
-#ifdef __WIN32__
+#ifdef _WIN32
 typedef int64 loff_t;
 #endif
 #ifndef HAVE_CADDR_T
 typedef char * caddr_t;
 #endif
 
+#ifdef _MSC_VER
+#ifdef _M_IX86
+#define __i386__
+#elif defined _M_AMD64
+#define __x86_64__
+#endif
+#endif
+
 /* Time data type for Time Manager emulation */
 typedef int64 tm_time_t;
 
@@ -207,31 +219,42 @@ static inline int spin_trylock(spinlock_t *lock)
 }
 #endif
 
-/* Intel x86 */
 #define X86_PPRO_OPT
+#define HAVE_OPTIMIZED_BYTESWAP_32
+#define HAVE_OPTIMIZED_BYTESWAP_16
+
+#ifdef _MSC_VER
+static inline uae_u32 do_get_mem_long(uae_u32 *a) {return _byteswap_ulong(*a);}
+static inline uae_u32 do_get_mem_word(uae_u16 *a) {return _byteswap_ushort(*a);}
+static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {*a = _byteswap_ulong(v);}
+static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {*a = _byteswap_ushort(v);}
+static inline uae_u32 do_byteswap_32_g(uae_u32 v) {return _byteswap_ulong(v);}
+static inline uae_u32 do_byteswap_16_g(uae_u32 v) {return _byteswap_ushort(v);}
+#else
+/* Intel x86 */
 static inline uae_u32 do_get_mem_long(uae_u32 *a) {uint32 retval; __asm__ ("bswap %0" : "=r" (retval) : "0" (*a) : "cc"); return retval;}
 #ifdef X86_PPRO_OPT
 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint32 retval; __asm__ ("movzwl %w1,%k0\n\tshll $16,%k0\n\tbswapl %k0\n" : "=&r" (retval) : "m" (*a) : "cc"); return retval;}
 #else
 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint32 retval; __asm__ ("xorl %k0,%k0\n\tmovw %w1,%w0\n\trolw $8,%w0" : "=&r" (retval) : "m" (*a) : "cc"); return retval;}
 #endif
-#define HAVE_GET_WORD_UNSWAPPED
-#define do_get_mem_word_unswapped(a) ((uae_u32)*((uae_u16 *)(a)))
 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {__asm__ ("bswap %0" : "=r" (v) : "0" (v) : "cc"); *a = v;}
 #ifdef X86_PPRO_OPT
 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {__asm__ ("bswapl %0" : "=&r" (v) : "0" (v << 16) : "cc"); *a = v;}
 #else
 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {__asm__ ("rolw $8,%0" : "=r" (v) : "0" (v) : "cc"); *a = v;}
 #endif
-#define HAVE_OPTIMIZED_BYTESWAP_32
 /* bswap doesn't affect condition codes */
 static inline uae_u32 do_byteswap_32_g(uae_u32 v) {__asm__ ("bswap %0" : "=r" (v) : "0" (v)); return v;}
-#define HAVE_OPTIMIZED_BYTESWAP_16
 #ifdef X86_PPRO_OPT
 static inline uae_u32 do_byteswap_16_g(uae_u32 v) {__asm__ ("bswapl %0" : "=&r" (v) : "0" (v << 16) : "cc"); return v;}
 #else
 static inline uae_u32 do_byteswap_16_g(uae_u32 v) {__asm__ ("rolw $8,%0" : "=r" (v) : "0" (v) : "cc"); return v;}
 #endif
+#endif
+
+#define HAVE_GET_WORD_UNSWAPPED
+#define do_get_mem_word_unswapped(a) ((uae_u32)*((uae_u16 *)(a)))
 
 #ifndef HAVE_OPTIMIZED_BYTESWAP_32
 static inline uae_u32 do_byteswap_32_g(uae_u32 v)
@@ -294,8 +317,6 @@ static inline uae_u32 do_byteswap_16_g(uae_u32 v)
 #define ENUMNAME(name) name
 #define write_log printf
 
-#define ATTRIBUTE_PACKED __attribute__((packed))
-
 #if defined(X86_ASSEMBLY) || defined(X86_64_ASSEMBLY)
 #define ASM_SYM(a) __asm__(a)
 #else
@@ -307,4 +328,8 @@ static inline uae_u32 do_byteswap_16_g(uae_u32 v)
 #endif
 #define REGPARAM2
 
+#ifdef _MSC_VER
+#define ATTRIBUTE_PACKED
+#endif
+
 #endif
diff --git a/BasiliskII/src/Windows/timer_windows.cpp b/BasiliskII/src/Windows/timer_windows.cpp
index 5399fdfc..d0aed8ac 100755
--- a/BasiliskII/src/Windows/timer_windows.cpp
+++ b/BasiliskII/src/Windows/timer_windows.cpp
@@ -20,9 +20,6 @@
 
 #include "sysdeps.h"
 
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
 #include "main.h"
 #include "macos_util.h"
 #include "timer.h"
@@ -169,9 +166,9 @@ int32 timer_host2mac_time(tm_time_t hosttime)
 	else {
 		uint64 t = TICKS2USECS(hosttime);
 		if (t > 0x7fffffff)
-			return t / 1000;	// Time in milliseconds
+			return int32(t / 1000);	// Time in milliseconds
 		else
-			return -t;			// Time in negative microseconds
+			return -int32(t);			// Time in negative microseconds
 	}
 }
 
diff --git a/BasiliskII/src/Windows/user_strings_windows.cpp b/BasiliskII/src/Windows/user_strings_windows.cpp
index 0b9de060..3ca501be 100755
--- a/BasiliskII/src/Windows/user_strings_windows.cpp
+++ b/BasiliskII/src/Windows/user_strings_windows.cpp
@@ -21,9 +21,6 @@
 #include "sysdeps.h"
 #include "user_strings.h"
 
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
 
 // Platform-specific string definitions
 user_string_def platform_strings[] = {
diff --git a/BasiliskII/src/Windows/util_windows.cpp b/BasiliskII/src/Windows/util_windows.cpp
index 10e586d2..130b8b8c 100755
--- a/BasiliskII/src/Windows/util_windows.cpp
+++ b/BasiliskII/src/Windows/util_windows.cpp
@@ -23,6 +23,8 @@
 #include "sysdeps.h"
 #include "util_windows.h"
 #include "main.h"
+#include <io.h>
+#include <fcntl.h>
 
 #include <list>
 using std::list;
@@ -35,10 +37,10 @@ BOOL exists( const char *path )
 	HFILE h;
 	bool ret = false;
 
-	h = _lopen( path, OF_READ );
-	if(h != HFILE_ERROR) {
+	h = _open( path, _O_RDONLY | _O_BINARY );
+	if(h != -1) {
 		ret = true;
-		_lclose(h);
+		_close(h);
 	}
 	return(ret);
 }
diff --git a/BasiliskII/src/Windows/xpram_windows.cpp b/BasiliskII/src/Windows/xpram_windows.cpp
index f69c0d0e..c47a9cb7 100755
--- a/BasiliskII/src/Windows/xpram_windows.cpp
+++ b/BasiliskII/src/Windows/xpram_windows.cpp
@@ -20,9 +20,6 @@
 
 #include "sysdeps.h"
 
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-
 #include <string>
 using std::string;