--- git-2.51.0/git-gui/git-gui.sh.orig	2025-08-18 02:18:23.000000000 +0200
+++ git-2.51.0/git-gui/git-gui.sh	2025-08-18 21:04:23.387867700 +0200
@@ -93,6 +93,11 @@
 	}
 }
 
+proc is_CygwinGit {} {
+	# Cygwin git running with Windows Tcl/Tk
+	return 1
+}
+
 ######################################################################
 ##
 ## PATH lookup. Sanitize $PATH, assure exec/open use only that
@@ -268,7 +273,11 @@
 if { [info exists ::env(GIT_GUI_LIB_DIR) ] } {
 	set oguilib $::env(GIT_GUI_LIB_DIR)
 } else {
-	set oguilib {@@GITGUI_LIBDIR@@}
+	if {[is_Windows] && [is_CygwinGit]} {
+		set oguilib [exec cygpath --windows --absolute {@@GITGUI_LIBDIR@@}]
+	} else {
+		set oguilib {@@GITGUI_LIBDIR@@}
+	}
 }
 set oguirel {@@GITGUI_RELATIVE@@}
 if {$oguirel eq {1}} {
@@ -1183,7 +1192,11 @@
 load_config 0
 apply_config
 
-set _gitworktree [git rev-parse --show-toplevel]
+if {[is_Windows] && [is_CygwinGit]} {
+	set _gitworktree [exec cygpath --windows [git rev-parse --show-toplevel]]
+} else {
+	set _gitworktree [git rev-parse --show-toplevel]
+}
 
 if {$_prefix ne {}} {
 	if {$_gitworktree eq {}} {
@@ -2123,7 +2136,11 @@
 	if {[is_Cygwin]} {
 		set explorer "/bin/cygstart.exe --explore"
 	} elseif {[is_Windows]} {
-		set explorer "explorer.exe"
+		if {[is_CygwinGit]} {
+			set explorer  [_which "explorer"]
+		} else {
+			set explorer "explorer.exe"
+		}
 	} elseif {[is_MacOSX]} {
 		set explorer "open"
 	} else {