fixed stripping of thumbs.db, better error reporting

stepmania/src/smpackage/SMPackageInstallDlg.cpp

@@ -184,7 +184,7 @@ void CSMPackageInstallDlg::OnOK()
 		}
 		catch (CException* e)
 		{
-			AfxMessageBox( "Error extracting files", MB_ICONSTOP );
+			e->ReportError();
 			e->Delete();
 			exit( 1 );
 		}

stepmania/src/smpackage/smpackage.cpp

@@ -88,6 +88,12 @@ BOOL CSmpackageApp::InitInstance()
 		// test to see if this is a smzip file
 		if( sPathLower.Right(3) == "zip" )
 		{
+			if( !DoesFileExist(sPath) )
+			{
+				AfxMessageBox( ssprintf("The file '%s' does not exist.  Aborting installation.",sPath), MB_ICONERROR );
+				exit(0);
+			}
+
 			// We found a zip package.  Prompt the user to install it!
 			CSMPackageInstallDlg dlg( sPath );
 			int nResponse = dlg.DoModal();

stepmania/src/smpackage/smpackageDlg.cpp

@@ -274,9 +274,9 @@ bool ExportPackage( CString sPackageName, const CStringArray& asDirectoriesToExp
 			// don't export "thumbs.db" files or "CVS" folders
 			CString sDir, sFName, sExt;
 			splitrelpath( sFilePath, sDir, sFName, sExt );
-			if( 0==stricmp(sFName,"thumbs.db") )
+			if( sFName.CompareNoCase("thumbs.db")==0 )
 				continue;	// skip
-			if( 0==stricmp(sFName,"CVS") )
+			if( sFName.CompareNoCase("thumbs.db")==0 )
 				continue;	// skip
 
 			try