diff --git a/.changes/fix-nsis-previous-installation-method.md b/.changes/fix-nsis-previous-installation-method.md
new file mode 100644
index 000000000000..452d4f5e85f8
--- /dev/null
+++ b/.changes/fix-nsis-previous-installation-method.md
@@ -0,0 +1,5 @@
+---
+'tauri-bundler': 'patch:bug'
+---
+
+On Windows, fix NSIS installer identifying a previous NSIS-installed app as WiX-installed app and then fails to uninstall it.
diff --git a/tooling/bundler/src/bundle/windows/templates/installer.nsi b/tooling/bundler/src/bundle/windows/templates/installer.nsi
index 93f0159e3c93..a7136f5865ad 100644
--- a/tooling/bundler/src/bundle/windows/templates/installer.nsi
+++ b/tooling/bundler/src/bundle/windows/templates/installer.nsi
@@ -1,7 +1,13 @@
+Unicode true
+SetCompressor /SOLID lzma
+
 !include MUI2.nsh
 !include FileFunc.nsh
 !include x64.nsh
 !include WordFunc.nsh
+!include "StrFunc.nsh"
+${StrCase}
+${StrLoc}
 
 !define MANUFACTURER "{{manufacturer}}"
 !define PRODUCTNAME "{{product_name}}"
@@ -31,8 +37,6 @@
 Name "${PRODUCTNAME}"
 BrandingText "{{copyright}}"
 OutFile "${OUTFILE}"
-Unicode true
-SetCompressor /SOLID lzma
 
 VIProductVersion "${VERSIONWITHBUILD}"
 VIAddVersionKey "ProductName" "${PRODUCTNAME}"
@@ -135,7 +139,11 @@ Function PageReinstall
     ReadRegStr $R0 HKLM "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$1" "DisplayName"
     ReadRegStr $R1 HKLM "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$1" "Publisher"
     StrCmp "$R0$R1" "${PRODUCTNAME}${MANUFACTURER}" 0 wix_loop
-    StrCpy $R5 "wix"
+    ReadRegStr $R0 HKLM "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$1" "UninstallString"
+    ${StrCase} $R1 $R0 "L"
+    ${StrLoc} $R0 $R1 "msiexec" ">"
+    StrCmp $R0 0 0 wix_done
+    StrCpy $R7 "wix"
     StrCpy $R6 "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$1"
     Goto compare_version
   wix_done:
@@ -149,7 +157,7 @@ Function PageReinstall
   ; and modify the messages presented to the user accordingly
   compare_version:
   StrCpy $R4 "$(older)"
-  ${If} $R5 == "wix"
+  ${If} $R7 == "wix"
     ReadRegStr $R0 HKLM "$R6" "DisplayVersion"
   ${Else}
     ReadRegStr $R0 SHCTX "${UNINSTKEY}" "DisplayVersion"
@@ -244,7 +252,7 @@ Function PageLeaveReinstall
     HideWindow
     ClearErrors
 
-    ${If} $R5 == "wix"
+    ${If} $R7 == "wix"
       ReadRegStr $R1 HKLM "$R6" "UninstallString"
       ExecWait '$R1' $0
     ${Else}