diff --git a/log/log.go b/log/log.go
index c56b87a..24533af 100644
--- a/log/log.go
+++ b/log/log.go
@@ -7,7 +7,8 @@ import (
 )
 
 func Init() {
-	file := "/tmp/thriftls.log"
+
+	file := os.TempDir() + "/thriftls.log"
 	logFile, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0766)
 	if err != nil {
 		panic(err)
@@ -17,5 +18,4 @@ func Init() {
 }
 
 type Logger struct {
-
 }
diff --git a/lsp/cache/file.go b/lsp/cache/file.go
index 1987eaf..c7fdeac 100644
--- a/lsp/cache/file.go
+++ b/lsp/cache/file.go
@@ -5,9 +5,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"fmt"
-	"os"
 	"sync"
-	"syscall"
 	"time"
 
 	"go.lsp.dev/protocol"
@@ -28,18 +26,6 @@ type FileID struct {
 // Like os.Stat, it reads through symbolic links.
 func GetFileID(filename string) (FileID, time.Time, error) { return getFileID(filename) }
 
-func getFileID(filename string) (FileID, time.Time, error) {
-	fi, err := os.Stat(filename)
-	if err != nil {
-		return FileID{}, time.Time{}, err
-	}
-	stat := fi.Sys().(*syscall.Stat_t)
-	return FileID{
-		device: uint64(stat.Dev), // (int32 on darwin, uint64 on linux)
-		inode:  stat.Ino,
-	}, fi.ModTime(), nil
-}
-
 type Hash [sha256.Size]byte
 
 // HashOf returns the hash of some data.
diff --git a/lsp/cache/file_posix.go b/lsp/cache/file_posix.go
new file mode 100644
index 0000000..a88971c
--- /dev/null
+++ b/lsp/cache/file_posix.go
@@ -0,0 +1,22 @@
+//go:build !windows && !plan9
+// +build !windows,!plan9
+
+package cache
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+func getFileID(filename string) (FileID, time.Time, error) {
+	fi, err := os.Stat(filename)
+	if err != nil {
+		return FileID{}, time.Time{}, err
+	}
+	stat := fi.Sys().(*syscall.Stat_t)
+	return FileID{
+		device: uint64(stat.Dev), // (int32 on darwin, uint64 on linux)
+		inode:  stat.Ino,
+	}, fi.ModTime(), nil
+}
diff --git a/lsp/cache/file_windows.go b/lsp/cache/file_windows.go
new file mode 100644
index 0000000..5e5b965
--- /dev/null
+++ b/lsp/cache/file_windows.go
@@ -0,0 +1,33 @@
+//go:build windows
+// +build windows
+
+package cache
+
+import (
+	"syscall"
+	"time"
+)
+
+// Note: it may be convenient to have this helper return fs.FileInfo, but
+// implementing this is actually quite involved on Windows. Since we only
+// currently use mtime, keep it simple.
+func getFileID(filename string) (FileID, time.Time, error) {
+	filename16, err := syscall.UTF16PtrFromString(filename)
+	if err != nil {
+		return FileID{}, time.Time{}, err
+	}
+	h, err := syscall.CreateFile(filename16, 0, 0, nil, syscall.OPEN_EXISTING, uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS), 0)
+	if err != nil {
+		return FileID{}, time.Time{}, err
+	}
+	defer syscall.CloseHandle(h)
+	var i syscall.ByHandleFileInformation
+	if err := syscall.GetFileInformationByHandle(h, &i); err != nil {
+		return FileID{}, time.Time{}, err
+	}
+	mtime := time.Unix(0, i.LastWriteTime.Nanoseconds())
+	return FileID{
+		device: uint64(i.VolumeSerialNumber),
+		inode:  uint64(i.FileIndexHigh)<<32 | uint64(i.FileIndexLow),
+	}, mtime, nil
+}