#perl -w
use strict;
use warnings;
use Config::IniFiles;

my ($appname, $cmdline, $priority, $szProcess);

my %config;
tie %config, 'Config::IniFiles', (-file => 'service.ini', -nocase => 1);

my @processesToStart 
	= map { $config{'service'}{$_} }
		grep { /^start[0-9]+/ } 
			keys %{$config{'service'}};


foreach $szProcess (@processesToStart) {

	#Break process down into it's parts
	($appname, $cmdline, $priority) = split /;/, $szProcess;
	
	#Process cmdline
	while ($cmdline =~ s/%([^%]+)-([^%]+)%/$config{lc $1}{lc $2}/eg) 
		{} 

	#Log and run it	already
	print $cmdline, "\n";
	
} 

__END__

Text of service.ini:

[GENERAL]
scheduledb=e:\users\dbush\schedule.db

[SERVICE]
debug=1
interval=5
start1=browser.exe;browser;NORMAL_PRIORITY_CLASS
start2=schedule.exe;schedule "localhost:%general-scheduledb%";NORMAL_PRIORITY_CLASS

Output:

browser
schedule "localhost:e:\users\dbush\schedule.gdb"