var test1 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles", @".test1.txt"));
var test2 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles", @"test2.txt"));//
var test3 = Path.GetFullPath(Path.Combine(@"C: usersdevdesktoptestfiles", @"test3.txt"));
var test4 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles",@".XXXtest4.txt"));
var test5 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles", @"XXXtest5.txt"));//
var test6 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles", @"XXXtest6.txt"));
var test7 = Path.GetFullPath(Path.Combine(@"C:usersdevdesktoptestfiles", @"somefilethatdoesntexist.txt"));//

test1 is "C:usersdevdesktoptestfilestest1.txt"
test2 is wrong "test2.txt"
test3 is "C: usersdevdesktoptestfilestest3.txt"
test4 is "C:usersdevdesktoptestfilesXXXtest4.txt"
test5 is wrong "c:XXXtest5.txt"
test6 is "C:usersdevdesktoptestfilesXXXtest6.txt"
test7 is wrong "c:somefilethatdoesntexist.txt"

source path + individual file path
\myserverproject1.x + dllimportant.dll

c:myproject + dllimportant.dll