diff --git a/yab-IDE/BuildFactory/BuildFactory.yab b/yab-IDE/BuildFactory/BuildFactory.yab
index c871b43..ac1e6db 100755
--- a/yab-IDE/BuildFactory/BuildFactory.yab
+++ b/yab-IDE/BuildFactory/BuildFactory.yab
@@ -60,6 +60,7 @@ Output_file$	= peek$("argument")
 Input_file$		= peek$("argument")
 appsig$         = peek$("argument")
 run_from_ide$		= peek$("argument")
+if appsig$="" appsig$=getappsig$(Input_file$)
 if appsig$="" appsig$="application/x-vnd.yab-app"
 SetAppSig(appsig$)
 
@@ -367,6 +368,34 @@ sub SetAppSig(sig$)
 
 end sub
 
+/////////////////////////////////////////////////////////////
+// set the application signature to match the mimetype declared in the file.
+/////////////////////////////////////////////////////////////
+
+
+sub getappsig$(infil$)
+local x,a$,i,ii
+open #22,infil$,"r" 
+for i=1 to 2
+line input #22 a$
+a$=lower$(a$)
+ii = instr(a$,"mimetype")
+if ii<>0 then
+a$=right$(a$,len(a$) - (ii+8))
+a$=trim$(a$)
+a$=right$(a$,len(a$)-1)
+a$=left$(a$,len(a$)-1)
+close #22
+return a$
+endif
+next
+close #22
+return ""
+
+
+end sub
+
+
 ////////////////////////////////////////
 ////////////////////////////////////////
 // the BuildFactory starts here
diff --git a/yab-IDE/BuildFactory/parts/YAB.bf.rdef b/yab-IDE/BuildFactory/parts/YAB.bf.rdef
index 930d089..a3a57b7 100644
--- a/yab-IDE/BuildFactory/parts/YAB.bf.rdef
+++ b/yab-IDE/BuildFactory/parts/YAB.bf.rdef
@@ -21,18 +21,3 @@ resource vector_icon {
 };
 
 
-resource app_signature "application/x-vnd.yab-app";
-
-resource app_version {
-	major  = 1,
-	middle = 7,
-	minor  = 5,
-
-	variety = B_APPV_FINAL,
-	internal = 2,
-
-	short_info = "Yab BASIC programming language",
-	long_info = "Yab allows fast prototyping with simple and clean code. yab contains a large number of BeAPI specific commands for GUI creation and much, much more."
-};
-
-resource app_flags 1;
diff --git a/yab-IDE/src/yab-IDE.yab b/yab-IDE/src/yab-IDE.yab
index 21f53d4..f3ba517 100755
--- a/yab-IDE/src/yab-IDE.yab
+++ b/yab-IDE/src/yab-IDE.yab
@@ -2248,7 +2248,8 @@ sub Building()
 	isEmpty = false
 
 	textcontrol 10,50 to 380,70, "BuildPath", "Target file name:", binName$, "BuildWindow"
-	AppSig$="application/x-vnd.yab-app"
+	AppSig$ = getappsig$(globalAllNames$(globalCurrentText))
+	if AppSig$="" AppSig$="application/x-vnd.yab-app"
 	textcontrol 10,80 to 380,100, "AppSig", "Application Signature:", AppSig$, "BuildWindow"
 	//button 390,50 to 490,70, "BuildBrowse", "Browse", "BuildWindow"
 
@@ -3926,4 +3927,26 @@ if x>0 then
 
 endif
 
+end sub
+
+sub getappsig$(infil$)
+local x,a$,i,ii
+open #122,infil$,"r" 
+for i=1 to 2
+line input #122 a$
+a$=lower$(a$)
+ii = instr(a$,"mimetype")
+if ii<>0 then
+a$=right$(a$,len(a$) - (ii+8))
+a$=trim$(a$)
+a$=right$(a$,len(a$)-1)
+a$=left$(a$,len(a$)-1)
+close #122
+return a$
+endif
+next
+close #122
+return ""
+
+
 end sub