diff --git a/src/file_find.cc b/src/file_find.cc
index 59c3f13..8ac3497 100644
--- a/src/file_find.cc
+++ b/src/file_find.cc
@@ -1,6 +1,9 @@
 #include "file_find.h"
 
+#include <fpattern.h>
+
 #include <stddef.h>
+#include <string.h>
 
 // 0x4E6380
 bool fileFindFirst(const char* path, DirectoryFileFindData* findData)
@@ -11,14 +14,33 @@ bool fileFindFirst(const char* path, DirectoryFileFindData* findData)
         return false;
     }
 #else
-    findData->dir = opendir(path);
+    strcpy(findData->path, path);
+
+    char drive[COMPAT_MAX_DRIVE];
+    char dir[COMPAT_MAX_DIR];
+    compat_splitpath(path, drive, dir, NULL, NULL);
+
+    char basePath[COMPAT_MAX_PATH];
+    compat_makepath(basePath, drive, dir, NULL, NULL);
+
+    findData->dir = opendir(basePath);
     if (findData->dir == NULL) {
         return false;
     }
 
     findData->entry = readdir(findData->dir);
+    while (findData->entry != NULL) {
+        char entryPath[COMPAT_MAX_PATH];
+        compat_makepath(entryPath, drive, dir, fileFindGetName(findData), NULL);
+        if (fpattern_match(findData->path, entryPath)) {
+            break;
+        }
+        findData->entry = readdir(findData->dir);
+    }
+
     if (findData->entry == NULL) {
         closedir(findData->dir);
+        findData->dir = NULL;
         return false;
     }
 #endif
@@ -34,9 +56,23 @@ bool fileFindNext(DirectoryFileFindData* findData)
         return false;
     }
 #else
+    char drive[COMPAT_MAX_DRIVE];
+    char dir[COMPAT_MAX_DIR];
+    compat_splitpath(findData->path, drive, dir, NULL, NULL);
+
     findData->entry = readdir(findData->dir);
+    while (findData->entry != NULL) {
+        char entryPath[COMPAT_MAX_PATH];
+        compat_makepath(entryPath, drive, dir, fileFindGetName(findData), NULL);
+        if (fpattern_match(findData->path, entryPath)) {
+            break;
+        }
+        findData->entry = readdir(findData->dir);
+    }
+
     if (findData->entry == NULL) {
         closedir(findData->dir);
+        findData->dir = NULL;
         return false;
     }
 #endif
@@ -50,8 +86,10 @@ bool findFindClose(DirectoryFileFindData* findData)
 #if defined(_MSC_VER)
     FindClose(findData->hFind);
 #else
-    if (closedir(findData->dir) != 0) {
-        return false;
+    if (findData->dir != NULL) {
+        if (closedir(findData->dir) != 0) {
+            return false;
+        }
     }
 #endif
 
diff --git a/src/file_find.h b/src/file_find.h
index 2bba6ed..be58bba 100644
--- a/src/file_find.h
+++ b/src/file_find.h
@@ -1,6 +1,8 @@
 #ifndef FILE_FIND_H
 #define FILE_FIND_H
 
+#include "platform_compat.h"
+
 #if defined(_WIN32)
 #define WIN32_LEAN_AND_MEAN
 #define NOMINMAX
@@ -35,6 +37,7 @@ typedef struct DirectoryFileFindData {
 #else
     DIR* dir;
     struct dirent* entry;
+    char path[COMPAT_MAX_PATH];
 #endif
 } DirectoryFileFindData;
 
diff --git a/src/loadsave.cc b/src/loadsave.cc
index fefd03f..9af13cd 100644
--- a/src/loadsave.cc
+++ b/src/loadsave.cc
@@ -57,6 +57,18 @@
 #define LS_COMMENT_WINDOW_X 169
 #define LS_COMMENT_WINDOW_Y 116
 
+// NOTE: The following are "normalized" path components for "proto/critters" and
+// "proto/items". The original code does not use uniform case for them (as
+// opposed to other path components like MAPS, SAVE.DAT, etc). It does not have
+// effect on Windows, but it's important on Linux and Mac, where filesystem is
+// case-sensitive. Lowercase is preferred as it is used in other parts of the
+// codebase (see `protoInit`, `gArtListDescriptions`).
+
+#define PROTO_DIR_NAME "proto"
+#define CRITTERS_DIR_NAME "critters"
+#define ITEMS_DIR_NAME "items"
+#define PROTO_FILE_EXT "pro"
+
 // 0x47B7C0
 const int gLoadSaveFrmIds[LOAD_SAVE_FRM_COUNT] = {
     237, // lsgame.frm - load/save game
@@ -233,16 +245,16 @@ void _InitLoadSave()
     }
 
     _MapDirErase("MAPS\\", "SAV");
-    _MapDirErase("PROTO\\CRITTERS\\", "PRO");
-    _MapDirErase("PROTO\\ITEMS\\", "PRO");
+    _MapDirErase(PROTO_DIR_NAME "\\" CRITTERS_DIR_NAME "\\", PROTO_FILE_EXT);
+    _MapDirErase(PROTO_DIR_NAME "\\" ITEMS_DIR_NAME "\\", PROTO_FILE_EXT);
 }
 
 // 0x47B85C
 void _ResetLoadSave()
 {
     _MapDirErase("MAPS\\", "SAV");
-    _MapDirErase("PROTO\\CRITTERS\\", "PRO");
-    _MapDirErase("PROTO\\ITEMS\\", "PRO");
+    _MapDirErase(PROTO_DIR_NAME "\\" CRITTERS_DIR_NAME "\\", PROTO_FILE_EXT);
+    _MapDirErase(PROTO_DIR_NAME "\\" ITEMS_DIR_NAME "\\", PROTO_FILE_EXT);
 }
 
 // SaveGame
@@ -1329,15 +1341,15 @@ int lsgPerformSaveGame()
     sprintf(_gmpath, "%s\\%s\\%s%.2d", _patches, "SAVEGAME", "SLOT", _slot_cursor + 1);
     compat_mkdir(_gmpath);
 
-    strcat(_gmpath, "\\proto");
+    strcat(_gmpath, "\\" PROTO_DIR_NAME);
     compat_mkdir(_gmpath);
 
     char* protoBasePath = _gmpath + strlen(_gmpath);
 
-    strcpy(protoBasePath, "\\critters");
+    strcpy(protoBasePath, "\\" CRITTERS_DIR_NAME);
     compat_mkdir(_gmpath);
 
-    strcpy(protoBasePath, "\\items");
+    strcpy(protoBasePath, "\\" ITEMS_DIR_NAME);
     compat_mkdir(_gmpath);
 
     if (_SaveBackup() == -1) {
@@ -1576,7 +1588,8 @@ int lsgSaveHeaderInSlot(int slot)
     char mapName[128];
     strcpy(mapName, gMapHeader.name);
 
-    char* v1 = _strmfe(_str, mapName, "sav");
+    // NOTE: Uppercased from "sav".
+    char* v1 = _strmfe(_str, mapName, "SAV");
     strncpy(ptr->file_name, v1, 16);
     if (fileWrite(ptr->file_name, 16, 1, _flptr) != 1) {
         return -1;
@@ -2141,7 +2154,9 @@ int _GameMap2Slot(File* stream)
             continue;
         }
 
-        const char* critterItemPath = (pid >> 24) == OBJ_TYPE_CRITTER ? "PROTO\\CRITTERS" : "PROTO\\ITEMS";
+        const char* critterItemPath = (pid >> 24) == OBJ_TYPE_CRITTER
+            ? PROTO_DIR_NAME "\\" CRITTERS_DIR_NAME
+            : PROTO_DIR_NAME "\\" ITEMS_DIR_NAME;
         sprintf(_str0, "%s\\%s\\%s", _patches, critterItemPath, path);
         sprintf(_str1, "%s\\%s\\%s%.2d\\%s\\%s", _patches, "SAVEGAME", "SLOT", _slot_cursor + 1, critterItemPath, path);
         if (fileCopyCompressed(_str0, _str1) == -1) {
@@ -2246,15 +2261,15 @@ int _SlotMap2Game(File* stream)
         return -1;
     }
 
-    sprintf(_str0, "%s\\", "PROTO\\CRITTERS");
+    sprintf(_str0, "%s\\", PROTO_DIR_NAME "\\" CRITTERS_DIR_NAME);
 
-    if (_MapDirErase(_str0, "PRO") == -1) {
+    if (_MapDirErase(_str0, PROTO_FILE_EXT) == -1) {
         debugPrint("LOADSAVE: returning 3\n");
         return -1;
     }
 
-    sprintf(_str0, "%s\\", "PROTO\\ITEMS");
-    if (_MapDirErase(_str0, "PRO") == -1) {
+    sprintf(_str0, "%s\\", PROTO_DIR_NAME "\\" ITEMS_DIR_NAME);
+    if (_MapDirErase(_str0, PROTO_FILE_EXT) == -1) {
         debugPrint("LOADSAVE: returning 4\n");
         return -1;
     }
@@ -2275,8 +2290,8 @@ int _SlotMap2Game(File* stream)
                 char protoPath[COMPAT_MAX_PATH];
                 if (_proto_list_str(pid, protoPath) == 0) {
                     const char* basePath = pid >> 24 == OBJ_TYPE_CRITTER
-                        ? "PROTO\\CRITTERS"
-                        : "PROTO\\ITEMS";
+                        ? PROTO_DIR_NAME "\\" CRITTERS_DIR_NAME
+                        : PROTO_DIR_NAME "\\" ITEMS_DIR_NAME;
                     sprintf(_str0, "%s\\%s\\%s", _patches, basePath, protoPath);
                     sprintf(_str1, "%s\\%s\\%s%.2d\\%s\\%s", _patches, "SAVEGAME", "SLOT", _slot_cursor + 1, basePath, protoPath);
 
diff --git a/src/map.cc b/src/map.cc
index b298f51..1623701 100644
--- a/src/map.cc
+++ b/src/map.cc
@@ -644,7 +644,8 @@ int mapScroll(int dx, int dy)
 char* mapBuildPath(char* name)
 {
     if (*name != '\\') {
-        sprintf(_map_path, "maps\\%s", name);
+        // NOTE: Uppercased from "maps".
+        sprintf(_map_path, "MAPS\\%s", name);
         return _map_path;
     }
     return name;
diff --git a/src/xfile.cc b/src/xfile.cc
index 0354d63..10a38fa 100644
--- a/src/xfile.cc
+++ b/src/xfile.cc
@@ -544,13 +544,17 @@ bool xlistEnumerate(const char* pattern, XListEnumerationHandler* handler, XList
 
     context.xlist = xlist;
 
+    char nativePattern[COMPAT_MAX_PATH];
+    strcpy(nativePattern, pattern);
+    compat_windows_path_to_native(nativePattern);
+
     char drive[COMPAT_MAX_DRIVE];
     char dir[COMPAT_MAX_DIR];
     char fileName[COMPAT_MAX_FNAME];
     char extension[COMPAT_MAX_EXT];
-    compat_splitpath(pattern, drive, dir, fileName, extension);
+    compat_splitpath(nativePattern, drive, dir, fileName, extension);
     if (drive[0] != '\0' || dir[0] == '\\' || dir[0] == '/' || dir[0] == '.') {
-        if (fileFindFirst(pattern, &directoryFileFindData)) {
+        if (fileFindFirst(nativePattern, &directoryFileFindData)) {
             do {
                 bool isDirectory = fileFindIsDirectory(&directoryFileFindData);
                 char* entryName = fileFindGetName(&directoryFileFindData);
@@ -594,6 +598,7 @@ bool xlistEnumerate(const char* pattern, XListEnumerationHandler* handler, XList
         } else {
             char path[COMPAT_MAX_PATH];
             sprintf(path, "%s\\%s", xbase->path, pattern);
+            compat_windows_path_to_native(path);
 
             if (fileFindFirst(path, &directoryFileFindData)) {
                 do {
@@ -622,8 +627,8 @@ bool xlistEnumerate(const char* pattern, XListEnumerationHandler* handler, XList
         xbase = xbase->next;
     }
 
-    compat_splitpath(pattern, drive, dir, fileName, extension);
-    if (fileFindFirst(pattern, &directoryFileFindData)) {
+    compat_splitpath(nativePattern, drive, dir, fileName, extension);
+    if (fileFindFirst(nativePattern, &directoryFileFindData)) {
         do {
             bool isDirectory = fileFindIsDirectory(&directoryFileFindData);
             char* entryName = fileFindGetName(&directoryFileFindData);