diff --git a/.github/workflows/build-linux.yml b/.github/workflows/build-linux.yml
index 21e5f9be..30acc5c1 100644
--- a/.github/workflows/build-linux.yml
+++ b/.github/workflows/build-linux.yml
@@ -744,6 +744,13 @@ jobs:
           if [ "$out" != "$want" ]; then
             echo "FAIL(stdin blank line): stdout was:"; echo "$out"; exit 1
           fi
+          # A UTF-8 BOM ahead of the first path, as a .NET or PowerShell caller
+          # on Windows writes, used to make the first input "no such input file".
+          out=$( { printf '\xEF\xBB\xBF'; printf '%s\n' a.txt b.txt c.txt; } | ./bin/nlp -ANA "$FIX" -WORK ./ -STDIN | tr -d '\r')
+          want=$(printf '%s\n' "first=1 last=0 dir=1 n=1" "first=0 last=0 dir=1 n=2" "first=0 last=1 dir=1 n=3")
+          if [ "$out" != "$want" ]; then
+            echo "FAIL(stdin BOM): stdout was:"; echo "$out"; exit 1
+          fi
           echo "[stdin] one load, KB carried across inputs, last-file flag set at end of stream"
 
       - name: Non-ASCII punctuation in rules (#467) (Non-20.04)
diff --git a/.github/workflows/build-windows.yml b/.github/workflows/build-windows.yml
index 40ab9e3c..25c5fe77 100644
--- a/.github/workflows/build-windows.yml
+++ b/.github/workflows/build-windows.yml
@@ -666,6 +666,13 @@ jobs:
           if [ "$out" != "$want" ]; then
             echo "FAIL(stdin blank line): stdout was:"; echo "$out"; exit 1
           fi
+          # A UTF-8 BOM ahead of the first path, as a .NET or PowerShell caller
+          # on Windows writes, used to make the first input "no such input file".
+          out=$( { printf '\xEF\xBB\xBF'; printf '%s\n' a.txt b.txt c.txt; } | ./bin/Release/nlp.exe -ANA "$FIX" -WORK ./ -STDIN | tr -d '\r')
+          want=$(printf '%s\n' "first=1 last=0 dir=1 n=1" "first=0 last=0 dir=1 n=2" "first=0 last=1 dir=1 n=3")
+          if [ "$out" != "$want" ]; then
+            echo "FAIL(stdin BOM): stdout was:"; echo "$out"; exit 1
+          fi
           echo "[stdin] one load, KB carried across inputs, last-file flag set at end of stream"
 
       - name: Non-ASCII punctuation in rules (#467)
diff --git a/lite/nlp_engine.cpp b/lite/nlp_engine.cpp
index 59c6d582..29f066b3 100644
--- a/lite/nlp_engine.cpp
+++ b/lite/nlp_engine.cpp
@@ -529,7 +529,13 @@ int NLP_ENGINE::analyzeStream(
     const char *space = " \t\r\n";
     std::string line, held;
     long count = 0;
+    bool first = true;
     while (std::getline(in, line)) {
+        // A .NET or PowerShell caller on Windows writes a UTF-8 BOM ahead of
+        // the first line, which made the first path "no such input file".
+        if (first && line.compare(0, 3, "\xEF\xBB\xBF") == 0)
+            line.erase(0, 3);
+        first = false;
         size_t beg = line.find_first_not_of(space);
         if (beg == std::string::npos)
             break;  // A blank line ends the stream, like EOF.
diff --git a/nlp/main.cpp b/nlp/main.cpp
index 76d9628f..ffea0e85 100644
--- a/nlp/main.cpp
+++ b/nlp/main.cpp
@@ -15,7 +15,7 @@ All rights reserved.
 #include "lite/nlp_engine.h"
 #include "version.h"
 
-#define NLP_ENGINE_VERSION "4.2.45"
+#define NLP_ENGINE_VERSION "4.2.46"
 
 bool cmdReadArgs(int, _TCHAR *argv[], _TCHAR *&, _TCHAR *&, _TCHAR *&, _TCHAR *&, bool &, bool &, bool &, bool &, bool &, bool &, int &, bool &, bool &, _TCHAR *&, double &);
 void cmdHelpargs(_TCHAR *);