diff --git a/exploreApp/src/Makefile b/exploreApp/src/Makefile
index 57e5865..8fbb8c7 100644
--- a/exploreApp/src/Makefile
+++ b/exploreApp/src/Makefile
@@ -7,7 +7,7 @@ include $(TOP)/configure/CONFIG
 
 USR_CPPFLAGS += -I$(TOP)/common
 
-PROD_SYS_LIBS_WIN32 += ws2_32 advapi32 user32
+USR_SYS_LIBS_WIN32 += ws2_32 advapi32 user32
 
 # explore app doesn't build with older vxworks (eg. tornado22)
 # don't build at all until someone asks
diff --git a/exploreApp/src/devexplore.cpp b/exploreApp/src/devexplore.cpp
index 833dd86..b0438ee 100644
--- a/exploreApp/src/devexplore.cpp
+++ b/exploreApp/src/devexplore.cpp
@@ -138,7 +138,7 @@ struct priv {
     template<typename VAL>
     VAL read(epicsUInt32 off=0) const
     {
-        epicsUInt32 OV(readraw<VAL>(off));
+        epicsUInt32 OV(readraw<epicsUInt32>(off));
         if(vmask) OV &= vmask;
         OV >>= vshift;
         return OV;
@@ -152,7 +152,7 @@ struct priv {
         unsigned i;
         for(i=0; i<count && addr<end; i++, addr+=step)
         {
-            epicsUInt32 OV = read<VAL>(addr);
+            epicsUInt32 OV = read<epicsUInt32>(addr);
             *val++ = castval<VAL,epicsUInt32>::op(OV);
         }
         return i;
@@ -408,14 +408,14 @@ long explore_read_real_val(REC *prec)
             Guard G(pvt->lock);
             ival = pun.ival = pvt->read<epicsUInt32>();
         }
+        epicsFloat64 dval = pun.fval;
+        dval += prec->roff;
+        if(prec->aslo) dval *= prec->aslo;
+        dval += prec->aoff;
+        if(prec->eslo) dval *= prec->eslo;
+        dval += prec->eoff;
 
-        pun.fval += prec->roff;
-        if(prec->aslo) pun.fval *= prec->aslo;
-        pun.fval += prec->aoff;
-        if(prec->eslo) pun.fval *= prec->eslo;
-        pun.fval += prec->eoff;
-
-        prec->val = pun.fval;
+        prec->val = dval;
 
         if(prec->tpro>1) {
             errlogPrintf("%s: read %08x -> %08x -> VAL=%g\n", prec->name, (unsigned)pvt->offset, (unsigned)ival, prec->val);
@@ -430,13 +430,14 @@ long explore_write_real_val(REC *prec)
 {
     TRY {
         punny32 pun;
-        pun.fval = prec->val;
+        epicsFloat64 dval = prec->val;
 
-        pun.fval -= prec->eoff;
-        if(prec->eslo) pun.fval /= prec->eslo;
-        pun.fval -= prec->aoff;
-        if(prec->aslo) pun.fval /= prec->aslo;
-        pun.fval -= prec->roff;
+        dval -= prec->eoff;
+        if(prec->eslo) dval /= prec->eslo;
+        dval -= prec->aoff;
+        if(prec->aslo) dval /= prec->aslo;
+        dval -= prec->roff;
+        pun.fval = (epicsFloat32)dval;
 
         if(prec->tpro>1) {
             errlogPrintf("%s: write %08x <- %08x <- VAL=%g\n", prec->name, (unsigned)pvt->offset, (unsigned)pun.ival, prec->val);
@@ -485,7 +486,7 @@ long explore_write_wf(waveformRecord *prec)
 {
     TRY {
         Guard G(pvt->lock);
-        unsigned nwritten = -1;
+        unsigned nwritten = 0;
         switch(prec->ftvl) {
         case menuFtypeCHAR  :
         case menuFtypeUCHAR : nwritten = pvt->writeArray((epicsUInt8*)  prec->bptr, prec->nord); break;
@@ -527,6 +528,8 @@ struct dset6 {
 
 } // namespace
 
+extern "C" {
+
 #define SUP(NAME, REC, OP, DIR, SIZE, END) static dset6<REC##Record> NAME = \
   {6, NULL, NULL, &explore_init_record_##OP<REC##Record,SIZE,END>, NULL, &explore_##DIR##_##OP<REC##Record>, NULL}; \
     epicsExportAddress(dset, NAME)
@@ -637,3 +640,4 @@ SUP(devExploreWfWriteU16MSB, write, 2, priv::BE);
 SUP(devExploreWfWriteU32NAT, write, 4, priv::NAT);
 SUP(devExploreWfWriteU32LSB, write, 4, priv::LE);
 SUP(devExploreWfWriteU32MSB, write, 4, priv::BE);
+} // extern "C"
diff --git a/exploreApp/src/devexplore_frib.cpp b/exploreApp/src/devexplore_frib.cpp
index 21ae974..2b00067 100644
--- a/exploreApp/src/devexplore_frib.cpp
+++ b/exploreApp/src/devexplore_frib.cpp
@@ -4,6 +4,8 @@
  */
 // FRIB specific operations
 
+#define NOMINMAX
+#include <algorithm>
 #include <list>
 #include <vector>
 #include <memory>
@@ -18,6 +20,7 @@
 #include <dbScan.h>
 #include <epicsThread.h>
 #include <recGbl.h>
+#include <dbAccess.h>
 #include <waveformRecord.h>
 #include <longoutRecord.h>
 #include <mbbiRecord.h>
@@ -161,7 +164,7 @@ struct flashProg : public epicsThreadRunable {
             assert((file.size()%16u==0));
 
             const epicsUInt32 fstart = flash_offset,
-                              fend  = flash_offset + std::min(file.size(), (size_t)flash_size);
+                              fend  = flash_offset + std::min((epicsUInt32)file.size(), flash_size);
 
             epicsUInt32 id = read32(REG_LOCKOUT);
             if(id!=0xF1A54001)
@@ -440,6 +443,9 @@ struct dset6 {
 
 } // namespace
 
+extern "C" {
 DSET(devExploreFRIBFlashWf,   &init_record_common, NULL, &load_bitfile_wf);
 DSET(devExploreFRIBFlashLo,   &init_record_common, NULL, &startstop_lo);
 DSET(devExploreFRIBFlashMbbi, &init_record_common, &status_get_iointr_info, &status_mbbi);
+} // extern "C"
+
diff --git a/exploreApp/src/testexplore.cpp b/exploreApp/src/testexplore.cpp
index 250cba2..e2bdcde 100644
--- a/exploreApp/src/testexplore.cpp
+++ b/exploreApp/src/testexplore.cpp
@@ -50,7 +50,7 @@ struct Channel {
         val.resize(nReq);
     }
     void put_int32(const std::vector<epicsUInt32>& val) {
-        if(dbChannelPutField(chan, DBF_ULONG, &val[0], val.size()))
+        if(dbChannelPutField(chan, DBF_ULONG, &val[0], (long)val.size()))
             testAbort("get %s fails", dbChannelName(chan));
     }
 };
diff --git a/pciApp/devLibPCI.c b/pciApp/devLibPCI.c
index 1325ff8..e0f92cd 100644
--- a/pciApp/devLibPCI.c
+++ b/pciApp/devLibPCI.c
@@ -39,6 +39,11 @@
 #define strdup(x) ({char*s=malloc(strlen(x)+1);s?strcpy(s,x):s;})
 #endif
 
+#ifdef _WIN32
+/* Windows uses different name for strtok_r */
+ #define strtok_r strtok_s
+#endif
+
 int devPCIDebug = 0;
 
 static ELLLIST pciDrivers;
diff --git a/pciApp/os/Linux/devLibPCIOSD.c b/pciApp/os/Linux/devLibPCIOSD.c
index 35a11ab..5b2927b 100644
--- a/pciApp/os/Linux/devLibPCIOSD.c
+++ b/pciApp/os/Linux/devLibPCIOSD.c
@@ -772,7 +772,7 @@ linuxDevPCIFindCB(
 static const char* fd2filename(int fd, char* buffer, size_t buffersize)
 {
     char procfile[32];
-    size_t n;
+    ssize_t n;
 
     sprintf(procfile, "/proc/self/fd/%d", fd);
     n = readlink(procfile, buffer, buffersize-1);
diff --git a/vmeApp/vmesh.c b/vmeApp/vmesh.c
index ccfa34a..ec80b06 100644
--- a/vmeApp/vmesh.c
+++ b/vmeApp/vmesh.c
@@ -67,7 +67,7 @@ int validate_widths(epicsUInt32 addr, int amod, int dmod, int count, volatile vo
     return 1;
   }
 
-  epicsPrintf("Mapped to 0x%08lx\n",(unsigned long)*mptr);
+  epicsPrintf("Mapped to 0x%p\n",*mptr);
 
   return 0;
 }
@@ -182,7 +182,7 @@ static
 void vmesh_handler(void *raw)
 {
   volatile epicsUInt8 *ent = raw;
-  unsigned vect = ent-vmeautodisable;
+  unsigned char vect = (unsigned char)(ent-vmeautodisable);
   char msg[] = "VME IRQ on vector 0xXY\n";
   unsigned I = sizeof(msg)-3;