diff --git a/toolbox/os_internal.cpp b/toolbox/os_internal.cpp
index ce4bb97..af42ea5 100644
--- a/toolbox/os_internal.cpp
+++ b/toolbox/os_internal.cpp
@@ -7,6 +7,8 @@
 
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/xattr.h>
+
 
 
 namespace OS { namespace Internal {
@@ -42,6 +44,151 @@ namespace OS { namespace Internal {
 
 	}
 
+
+	/*
+     
+     tech note PT515
+     ProDOS -> Macintosh conversion
+     
+     ProDOS             Macintosh
+     Filetype    Auxtype    Creator    Filetype
+     $00          $0000     'pdos'     'BINA'
+     $B0 (SRC)    (any)     'pdos'     'TEXT'
+     $04 (TXT)    $0000     'pdos'     'TEXT'
+     $FF (SYS)    (any)     'pdos'     'PSYS'
+     $B3 (S16)    (any)     'pdos'     'PS16'
+     $uv          $wxyz     'pdos'     'p' $uv $wx $yz
+     
+     Programmer's Reference for System 6.0:
+     
+     ProDOS Macintosh 
+     File Type Auxiliary Type Creator Type File Type 
+     $00        $0000           “pdos”  “BINA” 
+     $04 (TXT)  $0000           “pdos”  “TEXT” 
+     $FF (SYS)  (any)           “pdos”  “PSYS” 
+     $B3 (S16)  $DByz           “pdos”  “p” $B3 $DB $yz 
+     $B3 (S16)  (any)           “pdos”  “PS16” 
+     $D7        $0000           “pdos”  “MIDI” 
+     $D8        $0000           “pdos”  “AIFF” 
+     $D8        $0001           “pdos”  “AIFC” 
+     $E0        $0005           “dCpy”  “dImg” 
+     $FF (SYS)  (any)           “pdos”  “PSYS” 
+     $uv        $wxyz           “pdos”  “p” $uv $wx $yz 
+     
+	
+	  mpw standard:
+     $uv        (any)          "pdos"  printf("%02x  ",$uv)
+
+     */
+
+	uint16_t GetFinderInfo(const std::string &pathName, void *info, bool extended)
+	{
+		// todo -- move to separate function? used in multiple places.
+		uint8_t buffer[32];
+		std::memset(buffer, 0, sizeof(buffer));
+		int rv;
+
+		rv = ::getxattr(pathName.c_str(), XATTR_FINDERINFO_NAME, buffer, 32, 0, 0);
+
+		if (rv < 0)
+		{
+			switch (errno)
+			{
+				case ENOENT:
+				case EACCES:
+					return errno_to_oserr(errno);
+			}
+		}
+
+		// override for source files.
+		// TODO -- only override if missing?
+		if (IsTextFile(pathName))
+		{
+			std::memcpy(buffer, "TEXTMPS ", 8);
+		}	
+
+
+		// convert pdos types...
+		if (::memcmp(buffer + 4, "pdos", 4) == 0)
+		{
+			// mpw expects 'xx  ' where
+			// xx are the ascii-encode hex value of the file type.
+			// the hfs fst uses 'p' ftype8 auxtype16
+			if (buffer[0] == 'p')
+			{
+				static char Hex[] = "0123456789ABCDEF";
+
+				uint8_t ftype = buffer[1];
+				buffer[0] = Hex[ftype >> 4];
+				buffer[1] = Hex[ftype & 0x0f];
+				buffer[2] = ' ';
+				buffer[3] = ' ';
+			}
+		}
+
+		if (extended)
+			std::memcpy(info, buffer, 32);
+		else
+			std::memcpy(info, buffer, 16);
+		return 0;
+	}
+
+	unsigned tox(unsigned x)
+	{
+		if (x >= '0' && x <= '9') return x - '0';
+		if (x >= 'a' && x <= 'f') return x - 'a' + 10;
+		if (x >= 'A' && x <= 'F') return x - 'A' + 10;
+		return 0;
+	}
+
+	uint16_t SetFinderInfo(const std::string &pathName, void *info, bool extended)
+	{
+		uint8_t buffer[32];
+		std::memset(buffer, 0, sizeof(buffer));
+		int rv;
+
+		if (!extended)
+		{
+			rv = ::getxattr(pathName.c_str(), XATTR_FINDERINFO_NAME, buffer, 32, 0, 0);
+
+			if (rv < 0)
+			{
+				switch (errno)
+				{
+					case ENOENT:
+					case EACCES:
+						return errno_to_oserr(errno);
+				}
+			}
+		}
+
+		if (extended)
+			std::memmove(buffer, info, 16);
+		else
+			std::memmove(buffer, info, 32);
+
+		// convert pdos types.
+		if (::memcmp(buffer + 2, "  pdos", 6) == 0)
+		{
+			unsigned a = buffer[0];
+			unsigned b = buffer[1];
+
+			if (isxdigit(a) && isxdigit(b))
+			{
+				buffer[0] = 'p';
+				buffer[1] = (tox(a) << 4) | tox(b);
+				buffer[2] = 0;
+				buffer[3] = 0;
+			}
+		}
+
+		rv = ::setxattr(pathName.c_str(), XATTR_FINDERINFO_NAME, buffer, 32, 0, 0);
+		if (rv < 0) return errno_to_oserr(errno);
+
+		return 0;
+	}
+
+
 	int32_t mac_seek(uint16_t refNum, uint16_t mode, int32_t offset)
 	{
 		off_t rv;
diff --git a/toolbox/os_internal.h b/toolbox/os_internal.h
index 639e7e0..6c97f88 100644
--- a/toolbox/os_internal.h
+++ b/toolbox/os_internal.h
@@ -8,8 +8,8 @@ namespace OS { namespace Internal {
 
 	uint16_t errno_to_oserr(int xerrno);
 
-	uint16_t GetFinderInfo(const std::string &pathname, void *info);
-	uint16_t SetFinderInfo(const std::string &pathname, void *info);
+	uint16_t GetFinderInfo(const std::string &pathname, void *info, bool extended);
+	uint16_t SetFinderInfo(const std::string &pathname, void *info, bool extended);
 
 	uint16_t GetFileType(const std::string &pathname, uint16_t *fileType, uint32_t *auxType);