diff --git a/utils/dr_rdpng.cc b/utils/dr_rdpng.cc
index d17bfdc25..57a64ae2f 100644
--- a/utils/dr_rdpng.cc
+++ b/utils/dr_rdpng.cc
@@ -5,6 +5,11 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h> // strerror
+#ifndef _MSC_VER
+#include <libgen.h>
+#include <dirent.h>
+#include <sys/types.h>
+#endif
 
 #include "../simmem.h"
 #include "../simdebug.h"
@@ -136,7 +141,56 @@ bool load_block(unsigned char** block, unsigned* width, unsigned* height, const
 	// remember the file name for better error messages.
 	filename_ = fname;
 
-	if (FILE* const file = fopen(fname, "rb")) {
+	FILE* file = fopen(fname, "rb");
+
+#ifndef _MSC_VER
+	if (!file) {
+		// Try to case-insensitive search.
+		std::string actual_path;
+		size_t len = strlen(fname);
+		actual_path.reserve(len);
+		const char * sep_beg = fname;
+		const char * sep_end = sep_beg + strspn(sep_beg, "/");
+		if (sep_end == sep_beg) {
+			// relative
+			actual_path = "./";
+		}
+
+		char const * end = fname + len;
+
+		std::string name;
+		while (true) {
+			actual_path.insert(actual_path.end(), sep_beg, sep_end);
+			sep_beg = sep_end + strcspn(sep_end, "/");
+			if (sep_beg == sep_end) {
+				break;
+			}
+			name.assign(sep_end, sep_beg);
+		    DIR * dir = opendir(actual_path.c_str());
+			if (!dir) {
+				break;
+			}
+			struct dirent * ent = NULL;
+			while (ent = readdir(dir)) {
+				if (!strcasecmp(ent->d_name, name.c_str())) {
+					actual_path += ent->d_name;
+					break;
+				}
+			}
+			closedir(dir);
+			if (!ent) {
+				break;
+			}
+			if (sep_beg == end) {
+				file = fopen(actual_path.c_str(), "rb");
+				break;
+			}
+			sep_end = sep_beg + strspn(sep_beg, "/");
+		}
+	}
+#endif
+
+	if (file) {
 		read_png(block, width, height, file, base_img_size);
 		fclose(file);
 		return true;